student observation

IFETCE/ EEE /T.ILANSEZHIAN/ III YEAR/ VI SEM/ EE2356/ MP&MC LAB/ MANUAL/ VER 1.1

IFET COLLEGE OF ENGINEERING

Department of Electrical & Electronics Engineering

EE2356 - MICROPROCESSOR AND MICRO CONTROLLER LABORATORY

LAB MANUAL

STUDENT NAME :

REGISTER NO :

SEMESTER&SEC :

YEAR :

BATCH : 2011 - 2015

Lab In charge lab co-ordinator HOD


Ex. No

EXPERIMENTS Page No.

8 - BIT MICROPROCESSOR (8085)

1

1(a) 8- bit Addition1(b) 8 - bit Subtraction1(c) 8- bit Multiplication1(d) 8- bit Division

2

2(a) Ascending order2(b) Descending order2( c) Largest of a given numbers2(d) Smallest of a given numbers

3

3(a) Code Conversion: ASCII to Hexadecimal3(b) Code Conversion: Hexadecimal to ASCII3(c) Code Conversion: Hexadecimal to Binary3(d) Code Conversion: Hexadecimal to BCD

4 INTERFACING A/D AND D/A CONVERTER WITH 8085

5 Interfacing: Traffic Light Controller with 8085

66(a)Interfacing: 8251 with 80856(b) Interfacing: 8279 with 80856(c) Interfacing: 8253 with 8085

MICROCONTROLLER(8051)

77(a) Sum of elements in an array7(b) Sum using Stack7( c) Sum using call option

88(a) Interfacing: Stepper Motor with 80518(b) Interfacing: DAC with 8051

STUDY OF BASIC DIGITAL IC’S9 Verification of truth table for AND, OR, EXOR,

NOT, NOR, NAND, JK FF, RS FF,D FF10 Implementation of Boolean Functions, Adder /

Subtractor circuits11 Code converters, Encoder and Decoder12 Study of Flipflops13 Counters(synchronous and asynchronous), Shift

registers14 Differentiator, Integrator15 Timer IC applications


SYLLABUSEE2356 - MICROPROCESSOR AND MICRO CONTROLLER LABORATORY

AIM1. To understand programming using instruction sets of processors.2. To study various digital & linear

8-bit Microprocessor

1. Simple arithmetic operations:Multi precision addition / subtraction / multiplication / division.

2. Programming with control instructions:Increment / Decrement, Ascending / Descending order, Maximum / Minimum of numbers, Rotate instructions - Hex / ASCII / BCD code conversions.

3. Interface Experiments:• A/D Interfacing.• D/A Interfacing.• Traffic light controller.4. Interface Experiments: Simple experiments using 8251, 8279, 8254.

8-bit Microcontroller

5. Demonstration of basic instructions with 8051 Micro controller execution, including:• Conditional jumps, looping• Calling subroutines.• Stack parameter testing6. Parallel port programming with 8051 using port 1 facility:

- Stepper motor and D / A converter.

7. Study of Basic Digital IC’s(Verification of truth table for AND, OR, EXOR, NOT, NOR, NAND, JK FF, RS FF,D FF)8. Implementation of Boolean Functions, Adder / Subtractor circuits.9. Combination Logic; Adder, Subtractor, Code converters, Encoder and Decoder10. Sequential Logic; Study of Flip-Flop,Counters(synchronous and asynchronous),Shift Registers


LIST OF EXPERIMENTS

Ex. No Page No.

8 - BIT MICROPROCESSOR (8085)

1

8-Bit Arithmetic operations

Addition

Subtraction

Multiplication

Division

2

Array operations

Ascending order

Descending order

Largest element in an array

Smallest element in an array

3

Code conversion

ASCII to Hexadecimal

Hexadecimal to ASCII

Hexadecimal to Binary

Hexadecimal to BCD

4INTERFACING A/D AND D/A CONVERTER WITH 8085

5 Interfacing: Traffic Light Controller with 808566

Interfacing: 8251 with 80857 Interfacing: 8279 with 80858 Interfacing: 8253 with 8085

MICROCONTROLLER(8051)97

Sum of elements in an array10 Sum using Stack11 Sum using call option

12Interfacing: Stepper Motor with 8051

13 Interfacing: DAC with 8051


STUDY OF BASIC DIGITAL IC’S14 Verification of truth table for AND, OR, EXOR,

NOT, NOR, NAND, JK FF, RS FF,D FF15 Implementation of Boolean Functions, Adder /

Subtractor circuits16 Code converters, 17 Encoder18 Decoder19 Study of Flipflops20 Counters(Asynchronous)

21 Shift registers

22 Differentiator, Integrator23 Integrator24 Timer IC applications


8085 MICROPROCESSOR

1


Ex.No: 1 8-BIT ARITHMETIC OPERATIONS

AIM:

To write an assembly language program to add, subtract, multiply and divide the given data stored at two consecutive locations using 8085 microprocessor.

8 BIT DATA ADDITION:

ALGORITHM:

1. Initialize memory pointer to data location.2. Get the first number from memory in accumulator.3. Get the second number and add it to the accumulator.4. Store the answer at another memory location.

2


FLOW CHART:START

[C] 00H

[HL] 4500H

[A] [M]

[HL] [HL]+1

[A] [A]+[M]

Is there a NOCarry ?

YES

[C] [C]+1

[HL] [HL]+1

[M] [A]

[HL] [HL]+1

[M] [C]

STOP

3


PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENT4100 START MVI C, 00 Clear C reg.41014102 LXI H, 4500 Initialize HL reg. to

4500410341044105 MOV A, M Transfer first data to

accumulator4106 INX H Increment HL reg. to

point next memoryLocation.

4107 ADD M Add first number toacc. Content.

4108 JNC L1 Jump to location ifresult does not yieldcarry.

4109410A

410B INR C Increment C reg.410C L1 INX H Increment HL reg. to

point next memoryLocation.

410D MOV M, A Transfer the result fromacc. to memory.

410E INX H Increment HL reg. topoint next memoryLocation.

410F MOV M, C Move carry to memory4110 HLT Stop the program

4


8 BIT DATA SUBTRACTION

ALGORITHM:

1. Initialize memory pointer to data location.2. Get the first number from memory in accumulator.3. Get the second number and subtract from the accumulator.4. If the result yields a borrow, the content of the acc. is complemented and 01H is added

to it (2’s complement). A register is cleared and the content of that reg. is incremented in case there is a borrow. If there is no borrow the content of the acc. is directly taken as the result.

5. Store the answer at next memory location.

5


FLOW CHART: START

[C] 00H

[HL] 4500H

[A] [M]

[HL] [HL]+1

[A] [A]-[M]

NOIs there a Borrow ?

YES

Complement [A] Add 01H to [A]

[C] [C]+1

[HL] [HL]+1

[M] [A]

[HL] [HL]+1

[M] [C]

STOP

6


PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENT4100 START MVI C, 00 Clear C reg.41014102 LXI H, 4500 Initialize HL reg. to

4500410341044105 MOV A, M Transfer first data to

accumulator4106 INX H Increment HL reg. to

point next mem.Location.

4107 SUB M Subtract first numberfrom acc. Content.

4108 JNC L1 Jump to location ifresult does not yieldborrow.

4109410A

410B INR C Increment C reg.410C CMA Complement the Acc.

content410D ADI 01H Add 01H to content of

acc.410E410F L1 INX H Increment HL reg. to


4110 MOV M, A Transfer the result fromacc. to memory.

4111 INX H Increment HL reg. topoint next mem.Location.

4112 MOV M, C Move carry to mem.4113 HLT Stop the program

7


8 BIT DATA MULTIPLICATION:

ALGORITHM:

LOGIC: Multiplication can be done by repeated addition.

1. Initialize memory pointer to data location.2. Move multiplicand to a register.3. Move the multiplier to another register.4. Clear the accumulator.5. Add multiplicand to accumulator6. Decrement multiplier7. Repeat step 5 till multiplier comes to zero.8. The result, which is in the accumulator, is stored in a memory location.

8


FLOW CHART:

START

[HL] 4500

B M

[HL] [HL]+1

A 00

C 00

[A] [A] +[M]

Is there NOany carry

YES

C C+1

B B-1

NOIS B=0

YES

A

9


A

[HL] [HL]+1

[M] [A]

[HL] [HL]+1

[M] [C]

STOP

10


PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENT4100 START LXI H, 4500 Initialize HL reg. to

4500410141024103 MOV B, M Transfer first data to

reg. B4104 INX H Increment HL reg. to


4105 MVI A, 00H Clear the acc.41064107 MVI C, 00H Clear C reg for carry4108

4109 L1 ADD M Add multiplicandmultiplier times.

410A JNC NEXT Jump to NEXT if thereis no carry410B

410C

410D INR C Increment C reg

410E NEXT DCR B Decrement B reg410F JNZ L1 Jump to L1 if B is not

zero.411041114112 INX H Increment HL reg. to


4113 MOV M, A Transfer the result fromacc. to memory.


4115 MOV M, C Transfer the result fromC reg. to memory.

4116 HLT Stop the program

11


8 BIT DIVISION:

ALGORITHM:

LOGIC: Division is done using the method Repeated subtraction.1. Load Divisor and Dividend2. Subtract divisor from dividend3. Count the number of times of subtraction which equals the quotient4. Stop subtraction when the dividend is less than the divisor .The dividend now becomes

the remainder. Otherwise go to step 2.5. stop the program execution.

12


FLOWCHART: START

B 00

[HL] 4500

A M

[HL] [HL]+1

M A-M

[B] [B] +1

IS A<0

YES

A A+ M

B B-1

[HL] [HL]+1

[M] [A]

[HL] [HL]+1

[M] [B]

STOP

NO

13

PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENTS4100 MVI B,00 Clear B reg for quotient41014102 LXI H,4500 Initialize HL reg. to

4500H410341044105 MOV A,M Transfer dividend to

acc.4106 INX H Increment HL reg. to


4107 LOOP SUB M Subtract divisor fromdividend

4108 INR B Increment B reg4109 JNC LOOP Jump to LOOP if

result does not yieldborrow

410A410B410C ADD M Add divisor to acc.410D DCR B Decrement B reg410E INX H Increment HL reg. to


410F MOV M,A Transfer the remainderfrom acc. to memory.


4111 MOV M,B Transfer the quotientfrom B reg. to memory.

4112 HLT Stop the program

OBSERVATION:

14

ADDITION:

S.NO INPUT OUTPUTADDRESS DATA ADDRESS DATA

1 4500 45024501 4503

2 4500 45024501 4503

SUBTRACTION:


1 4500 45024501 4503

2 4500 45024501 4503

MULTIPLICATION:


1 4500 45024501 4503

2 4500 45024501 4503

DIVISION:


1 4500 45024501 4503

2 4500 45024501 4503

15

RESULT:

Thus the addition, subtraction, multiplication and division of two numbers was performed using the 8085 microprocessor.

16

Ex.No: 2 SORTING OF AN ARRAY

AIM:

To write an assembly language program to arrange an array of data in ascending and descending order and to find the smallest and largest data among the array.

ASCENDING ORDER

ALGORITHM:

1. Get the numbers to be sorted from the memory locations.2. Compare the first two numbers and if the first number is larger than second then I interchange the number.3. If the first number is smaller, go to step 44. Repeat steps 2 and 3 until the numbers are in required order

17

FLOWCHART:

YES

START

[B] 04H

[HL] [8100H]

[C] 04H

[A] [HL]

[HL] [HL] + 1

IS

[A] < [HL]?

NO

[D] [HL]

[HL] [A]

[HL] [HL] - 1

[HL] [D]

[HL] [HL] + 1

[C] [C] - 01 H

A

18

A

IS NO[C] = 0?

YES

[B] [B]-1

IS NO[B] = 0?

YES

STOP

19

PROGRAM:

ADDRESS OPCODE

LABEL MNEMONICS OPERAND

COMMENTS

4100 MVI B,04 Initialize B reg withnumber of comparisons(n-1)

4101

4102 LOOP 3 LXI H,4200 Initialize HL reg. to4200H4103

41044105 MVI C,04 Initialize C reg with no.

of comparisons(n-1)41064107 LOOP2 MOV A,M Transfer first data to

acc.4108 INX H Increment HL reg. to

point next memorylocation

4109 CMP M Compare M & A410A JC LOOP1 If A is less than M then

go to loop1410B410C410D MOV D,M Transfer data from M to

D reg410E MOV M,A Transfer data from acc

to M410F DCX H Decrement HL pair4110 MOV M,D Transfer data from D to

M4111 INX H Increment HL pair4112 LOOP1 DCR C Decrement C reg4113 JNZ LOOP2 If C is not zero go to

loop2411441154116 DCR B Decrement B reg4117 JNZ LOOP3 If B is not Zero go to

loop341184119411A HLT Stop the program

20

DESCENDING ORDER

ALGORITHM:

1. Get the numbers to be sorted from the memory locations.2. Compare the first two numbers and if the first number is smaller than second then I interchange the number.3. If the first number is larger, go to step 44. Repeat steps 2 and 3 until the numbers are in required order

21

FLOWCHART:

NO

START

[B] 04H

[HL] [8100H]

[C] 04H

[A] [HL]

[HL [HL] + 1

IS

[A] < [HL]?

YES

[D] [HL]

[HL] [A]

[HL] [HL] - 1

[HL] [D]

[HL] [HL] + 1

[C] [C] - 01 H

A

22

A

IS NO[C] = 0?

YES

[B] [B]-1

IS NO[B] = 0?

YES

STOP

23

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4100 MVI B,04 Initialize B reg with numberof comparisons (n-1)4101

4102 LOOP 3 LXI H,4200 Initialize HL reg. to4200H4103

41044105 MVI C,04 Initialize C reg with no. of

comparisons(n-1)41064107 LOOP2 MOV A,M Transfer first data to acc.4108 INX H Increment HL reg. to point

next memory location4109 CMP M Compare M & A410A JNC LOOP1 If A is greater than M then go

to loop1410B410C410D MOV D,M Transfer data from M to D reg410E MOV M,A Transfer data from acc to M410F DCX H Decrement HL pair4110 MOV M,D Transfer data from D to M4111 INX H Increment HL pair4112 LOOP1 DCR C Decrement C reg4113 JNZ LOOP2 If C is not zero go to loop2411441154116 DCR B Decrement B reg4117 JNZ LOOP3 If B is not Zero go to loop341184119411A HLT Stop the program

24

LARGEST ELEMENT IN AN ARRAY

ALGORITHM:

1. Place all the elements of an array in the consecutive memory locations.

2. Fetch the first element from the memory location and load it in the accumulator.

3. Initialize a counter (register) with the total number of elements in an array.

4. Decrement the counter by 1.

5. Increment the memory pointer to point to the next element.

6. Compare the accumulator content with the memory content (next

element).

7. If the accumulator content is smaller, then move the memory content

(largest element) to the accumulator. Else continue.


9. Repeat steps 5 to 8 until the counter reaches zero

10. Store the result (accumulator content) in the specified memory location.

25

FLOW CHART:

START

[HL] [8100H]

[B] 04H

[A] [HL]

[HL [HL] + 1

NO IS[A] < [HL]?

YES

[A] [HL]

[B] [B]-1

IS NO[B] = 0?

YES

[8105] [A]

STOP

26

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4101 LXI H,4200 Initialize HL reg. to4200H4102

41034104 MVI B,04 Initialize B reg with no. of

comparisons(n-1)41054106 MOV A,M Transfer first data to acc.4107 LOOP1 INX H Increment HL reg. to point

next memory location4108 CMP M Compare M & A4109 JNC LOOP If A is greater than M then go

to loop410A410B410C MOV A,M Transfer data from M to A reg410D LOOP DCR B Decrement B reg410E JNZ LOOP1 If B is not Zero go to loop1410F41104111 STA 4205 Store the result in a memory

location.411241134114 HLT Stop the program

27

SMALLEST ELEMENT IN AN ARRAY

ALGORITHM:

1. Place all the elements of an array in the consecutive memory locations.

2. Fetch the first element from the memory location and load it in the accumulator.

3. Initialize a counter (register) with the total number of elements in an array.


5. Increment the memory pointer to point to the next element.

6. Compare the accumulator content with the memory content (next

element).

7. If the accumulator content is smaller, then move the memory content

(largest element) to the accumulator. Else continue.


9. Repeat steps 5 to 8 until the counter reaches zero

10. Store the result (accumulator content) in the specified memory location.

28

FLOW CHART:

START

[HL] [8100H]

[B] 04H

[A] [HL]

[HL [HL] + 1

YES IS[A] < [HL]?

NO

[A] [HL]

[B] [B]-1

IS NO[B] = 0?

YES

[8105] [A]

STOP

29

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4101 LXI H,4200 Initialize HL reg. to4200H4102

41034104 MVI B,04 Initialize B reg with no. of

comparisons(n-1)41054106 MOV A,M Transfer first data to acc.4107 LOOP1 INX H Increment HL reg. to point

next memory location4108 CMP M Compare M & A4109 JC LOOP If A is lesser than M then go

to loop410A410B410C MOV A,M Transfer data from M to A reg410D LOOP DCR B Decrement B reg410E JNZ LOOP1 If B is not Zero go to loop1410F41104111 STA 4205 Store the result in a memory

location.411241134114 HLT Stop the program

30

OBSERVATION:

A. ASCENDING ORDER

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4200 42004201 42014202 42024203 42034204 4204

B. DESCENDING ORDER

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4200 42004201 42014202 42024203 42034204 4204

C. SMALLEST ELEMENT

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4200

42054201420242034204

D. LARGEST ELEMENT

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4200

42054201420242034204

31

RESULT:

Thus the sorting operations of arranging an array in ascending, descending order and the largest and smallest element were found using the 8085 microprocessor.

32

Ex.No: 3 CODE CONVERSIONS

AIM:

To write an assembly language program to perform the conversions of ASCII to hexadecimal number, hexadecimal to ASCII, hexadecimal to decimal number, binary to hexadecimal number and hexadecimal to binary number.

ASCII TO HEXADECIMAL

ALGORITHM:

1. Start the program2. Load the data from address 4200 to A3. Move data from accumulator to C4. Move data from M to HL pair to accumulator5. Subtract the data 30 from A6. Decrement content of register7. Stop the program if C is zero8. Jump to Step 59. End the program

33

FLOWCHART:

Start

Set the ASCII value

Subtract 30 from A

Decrement the register content

Checkfor

Carry?

NO

Subtract 07 from A

Store the hex value

Stop

YES

34

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4100 LDA H,4200 Load data 4200 to A410141024103 MOV C,A 4F Move data from A to C4104 LXI H,4201 Load address 4201 in HL410541064107 LXI D,4301 Load address 4301 in DF41084109410A LOOP 1 MOV A,M Move data from M to A410B SUI 30 Subtract 30 from A410C410D STAX D Store data from

accumulator to DE410E DCR C Decrement from C

register410F JZ LOOP Stop program if C is 0411041114112 INX H Increment HL register

pair4113 INX D Increment DE register

pair4114 JMP LOOP 1 Jump to 410A411541164117 LOOP HLT Stop

35

HEXADECIMAL TO ASCII

ALGORITHM:

1. Start the program2. Load the data from address 4200 to A3. Move data from accumulator to C4. Move data from M to HL pair to accumulator5. Add the data 30 to A6. Decrement content of register7. Stop the program if C is zero8. Jump to Step 59. End the program

36

FLOWCHART:

Start

Set the ASCII value

Add 30 to A

Decrement the register content

Checkfor

Carry?

NO

YES

Store the decimal value

Stop

37

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4100 LDA H,4200 Load data 4200 to A410141024103 MOV C,A 4F Move data from A to C4104 LXI H,4201 Load address 4201 in HL410541064107 LXI D,4301 Load address 4301 in DF41084109410A LOOP 1 MOV A,M Move data from M to A410B ADI 30 Subtract 30 from A410C410D STAX D Store data from

accumulator to DE410E DCR C Decrement from C

register410F JZ LOOP Stop program if C is 0411041114112 INX H Increment HL register

pair4113 INX D Increment DE register

pair4114 JMP LOOP 1 Jump to 410A411541164117 LOOP HLT Stop

38

HEXADECIMAL TO BINARY

ALGORITHM:

1. Start the program2. Move the content of memory to accumulator3. Move data 0B o register B4. Increment the content of HL register pair5. Rotate the accumulator right6. Jump to the specified address if carry generated7. Move 00 to memory8. Jump to specified address if there is no zero9. Move 01 to memory10. Jump to specified address if there is no zero11. End the program

39

FLOWCHART:

Start

Load address in HL pair

Move data from M to A

Initialize counter B to 08

Increment HL register pair

Rotate accumulator right

Check forCarry?

NO

Move data from 00 to M

Move data from 01 to M

Decrement B register

NO

If B=0?

YES

Stop

YES

40

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND COMMENTS

4100 LXI H,4200 Load address in HL pair410141024103 MOV A,M Move content of M to A4104 MVI B 08 Move 0B to register pair41054106 L3 INX H Increment the content of

HL pair4107 RRC Rotate accumulator right4108 JC L1 Jump to specified address

if carry4109410A410B MVI M 00 Move 00 to M410C JMP L2 Decrement B register410D410E410F L1 MVI M 01 Move 01 to M41104111 L2 DCR B Decrement B by 14112 JNZ L3 Jump to the specified

address if no zero411341144115 HLT Stop the program

41

BINARY TO HEXADECIMAL

ALGORITHM:

1. Start the program2. Load the address in HL pair3. Move the content of memory to accumulator4. Add the content of accumulator with previous content of accumulator5. Move the content of B to accumulator6. Add the content of accumulator with previous content of accumulator7. Repeat step 68. Add B with accumulator content9. Increment H by 110. Move content of M to A11. End the program

42

FLOWCHART:

Start


Move data from M to A

Add content of A to register B

Add content of A with itself

Add content of A to register B

Increment HL reg pair

Add content of M with accumulator

Increment HL reg pair content

Move content of M to accumulator

Stop

43

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND COMMENTS

4100 LXI H,4150 Load address in HL pair410141024103 MOV M,A Move content of A to M4104 ADD A Add A content with

previous content of A4105 MOV B,A Move the content from

A to B4106 ADD A Add A content with

previous content of A4107 ADD B Add B content with A4108 INX H Increment H by 14109 ADD M Add M content with A410A INX H Increment H by 1410B MOV M,A Move content of A to M410C HLT Stop the program

44

HEXADECIMAL TO DECIMAL

ALGORITHM:

1. Start the program2. Load the address in HL pair3. Move the content from HL to A4. Subtract 64 from A5. Increment BC pair6. Jump to address 42077. Subtract 0A from A8. Increment HL pair9. Rotate accumulator left10. Increment HL pair11. End the program

45

FLOWCHART:

Start


Initialize D register

Clear accumulator

Move HL to C register

Add 01 with A

Adjust A to BCD

CheckCarry?

NO

Increment D register

Increment C register

NOCheckCarry?

YES

Store A in 4151 H

Move D to accumulator

Store A in 4150 H

Stop

YES

46

PROGRAM:

ADDRESS

OPCODE

LABEL MNEMONICS

OPERAND

COMMENTS

4100 LXI H 4150 Load data from 4150 to HL pair41014102 LXI B 0000 Load data from address to BC4103410441054106 MOV A,M Move the content from HL to A4107 L4 SUI 64 Subtract 64 from A41084109 JC L1 Stop if A has carry410A410B410C INR B Increment BC410D JMP L4 Jump to specified address410E410F4110 L1 ADI 64 Add 64 to A41114112 L3 SUI 0A Subtract 0A from A41134114 JC L2 Stop if A has carry411541164117 INR C Increment HL4118 L2 JNC L3 Stop if A has no carry4119411A411B ADI 0A Add 0A to A411D INX H Increment HL411E MOV M,B Move B to M411F MOV B,A Move A to B4120 MOV A,B Move B to A4121 RLC Rotate accumulator4122 RLC Rotate accumulator4123 RLC Rotate accumulator4124 RLC Rotate accumulator4125 ADD B Add B to A4126 INX H Increment H by 14127 MOV M,A Move content of A to M4128 HLT Stop the program

47

OBSERVATION:

A. ASCII TO HEXADECIMAL

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4201 4301

B. HEXADECIMAL TO ASCII

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

4201 4301

C. HEXADECIMAL TO BINARY

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

42004200 42044201 42054202 42064203 4207

D. BINARY TO HEXADECIMAL

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

415041524151

E. HEXADECIMAL TO DECIMAL

INPUT OUTPUTMEMORY

LOCATIONDATA MEMORY

LOCATIONDATA

415041524151

48

RESULT:

Thus the assembly language programs for various code conversions are executed using

8085 microprocessor.

49

EX.No:4 INTERFACING A/D AND D/A CONVERTER WITH 8085

AIM : To write an assembly language program to convert an analog signal into a digital signal

and a digital signal into an analog signal using an ADC interfacing and DAC interfacing respectively.

A. ADC INTERFACING WITH 8085

APPARATUS REQUIRED:

SL.NO ITEM SPECIFICATION QUANTITY1 Microprocessor kit 8085,Vi Microsystems 12 Power supply +5 V dc 13 ADC Interface board Vi Microsystems 1

PROBLEM STATEMENT :

To program starts from memory location 4100H. The program is executed for various values of analog voltage which are set with the help of a potentiometer. The LED display is verified with the digital value that is stored in the memory location 4150H.

THEORY:An ADC usually has two additional control lines: the SOC input to tell the ADC when

to start the conversion and the EOC output to announce when the conversion is complete. The following program initiates the conversion process, checks the EOC pin of ADC 0419 as to whether the conversion is over and then inputs the data to the processor. It also instructs the processor to store the converted digital data at RAM 4200H.

ALGORITHM:1. Select the channel and latch the address.2. Send the start conversion pulse.3. Read EOC signal.4. If EOC =1 continue else go to step (3)5. Read the digital output.6. Store it in a memory location.

50

PROGRAM:

ADDRESS LABEL MNEMON ICS OPCODE

OPERAND

COMMENTS

4100 MVI A 10 Select channel 0 and tomake accumulator low

41014102 OUT C8 Output the data41034104 MVI A 18 Make accumulator high41054106 OUT C8 Display the data41074108 MVI A 01 Make 01 to accumulator4109410A OUT D0 Display the data410B410C XRA XOR with accumulator410D XRA XOR with accumulator410E XRA XOR with accumulator410F MVI A 00 Make 00 to accumulator4110

4111 OUT D0 Load D0 in output port41124113 LOOP IN D8

4114

4115 ANI 01 Do and operation directly41164117 CPI 01 Compare with accumulator41184119 JNZ LOOP Jump to specified address411A411B411C IN C0411D411E STA 4150 Store the data411F41204121 HLT End the program

51

ADC- CIRCUIT:

SOC JUMPER SELECTION:

J2 : SOC Jumper selectionJ5 : Channel selection

52

OBSERVATION

ANALOG VOLTAGE DIGITAL DATA ONLED DISPLAY

HEX CODE INLOCATION 4150

53

DAC INTERFACING WITH 8085

APPARATUS REQUIRED:

SL.NO ITEM SPECIFICATION QUANTITY1 Microprocessor kit 8085,Vi Microsystems 12 Power supply +5 V dc 13 DAC Interface board Vi Microsystems 1

SOFTWARE EXAMPLES

The following examples illustrate how to control the DAC using 8085 and generate sine wave, saw tooth wave by means of software.

(a) SQUARE WAVE GENERATION:

The basic idea behind the generation of waveforms is the continuous generation of Analog output of DAC. With 00(HEX) as input to DAC2, the analog output is -5V. Similarly, with FF (Hex) as input, the output is +5V. Outputting digital data 00 and FF at regular intervals, to DAC2, results in a square wave of amplitude I5 Volts

ALGORITHM:

1. Load the initial value (00) to Accumulator and move it to DAC.2. Call the delay program3. Load the final value (FF) to accumulator and move it to DAC.4. Call the delay program.5. Repeat steps 2 to 5.

PROGRAM:


OPERAND COMMENT

4100 START MVI A 00 Move 00 to A register41014102 OUT C8 Load C8 to output port41034104 CALL DELAY DELAY Call delay program4107 MVI A FF Load FF to B register4109 OUT C8410B CALL DELAY DELAY410E JMP START START Jump to start of address4112 DELAY MVI B 05 Move 05 to B register4114 L1 MVI C FF Move FF to C register

54

4116 L2 DCR C Decrement C4117 JNZ L2 L2 Jump to L2 if no zero411A DCR B Decrement B register

411B JNZ L1 L1 Jump to L1 if no zero411E RET

Execute the program and using a CRO, verify that the waveform at the DAC2 output is a square-wave. Modify the frequency of the square-wave, by varying the time delay.

(b) SAW TOOTH GENERATION:

ALGORITHM:

1. Load the initial value (00) to Accumulator2. Move the accumulator content to DAC.3. Increment the accumulator content by 1.4. Repeat steps 3 and 4.

Output digital data from 00 to FF constant steps of 01 to DAC1 repeat this sequence again and again. As a result a saw - tooth wave will be generated at DAC1 output.

PROGRAM:


OPERAND

COMMENT

4100 START MVI A 00 Load 00 to accumulator4102 L1 OUT C0 Load CO in output port4104 INR A Increment A register4105 JNZ L1 L1 Jump to L1 if no zero4108 JMP START START Go to START

unconditionally

(c) TRIANGULAR WAVE GENERATION:

ALGORITHM:

1. Load the initial value (00) to Accumulator.2. Move the accumulator content to DAC3. Increment the accumulator content by 1.4. If accumulator content is zero proceed to next step. Else go to step 3.5. Load value (FF) to accumulator.6. Move the accumulator content to DAC.7. Decrement the accumulator content by 1.8. If accumulator content is zero go to step 2. Else go to step 2.

The following program will generate a triangular wave at DAC2 output.

55

PROGRAM:


OPERAND

COMMENT

START MVI L 00 Move 00 to L registerL1 MOV A,L Load L to a register

OUT C8 Load c8 to output portINR L Increment L registerJNZ L1 L1 Jump to L1 if no zeroMVI L FF Load FF to L register

L2 MOV A,L Move L to a registerOUT C8 Load C8 to output portDCR L Decrement L registerJNZ L2 L2 Jump to L2 if no zeroJMP START START Go to START unconditionally

56

DAC - CIRCUIT:

WAEFORMS:

57

OBSERVATION:

WAVE FORMS AMPLITUDE TIME PERIODSquare waveformSaw tooth waveformTriangular waveform

Result:Thus the conversion of an analog signal into a digital signal and a digital signal into an

analog signal was done using interfacing of ADC and DAC respectively with 8085.

58

EX.No:5 TRAFFIC LIGHT CONTROLLER WITH 8085

AIMTo write an assembly language program to simulate the traffic light at an intersection

using a traffic light interface.

APPARATUS REQUIRED:

SL.NO ITEM SPECIFICATION QUANTITY1 Microprocessor kit 4185,Vi Microsystems 12 Power supply +5 V dc 13 Traffic light interface kit Vi Microsystems 1

ALGORITHM : 1. Initialize the ports.2. Initialize the memory content, with some address to the data.3. Read data for each sequence from the memory and display it through the ports.4. After completing all the sequences, repeat from step2.

A SAMPLE SEQUENCE:1. (a) Vehicles from south can go to straight or left.

(b) Vehicles from west can cross the road.(c) Each pedestrian can cross the road.(d) Vehicles from east no movement.(e) Vehicles from north, can go only straight.

2. All ambers are ON, indicating the change of sequence.

3. (a) Vehicles from east can go straight and left.(b) Vehicles from south, can go only left.(c) North pedestrian can cross the road.(d) Vehicles from north, no movement.(e) Vehicles from west, can go only straight.


5. (a) Vehicles from north can go straight and left.(b) Vehicles from east, can go only left.(c) West pedestrian can cross the road.(d) Vehicles from west, no movement.(e) Vehicles from south, can go only straight.


59

7. (a) Vehicles from west can go straight and left.(b) Vehicles from north, can go only left.(c) South pedestrian can cross the road.(d) Vehicles from south, no movement.(e) Vehicles from east, can go only straight.


9. (a) All vehicles from all directions no movement.(b) All pedestrian can cross the road.

BIT ALLOCATION:

BIT LED BIT LED BIT LED

PA0 SOUTH LEFT PB0 NORTH LEFT PC0 WEST STRAIGHTPA1 SOUTH RIGHT PB1 NORTH RIGHT PC1 NORTH STRAIGHTPA2 SOUTH AMBER PB2 NORTH AMBER PC2 EAST STRAIGHTPA3 SOUTH RED PB3 NORTH RED PC3 SOUTH STRAIGHTPA4 EAST LEFT PB4 WEST LEFT PC4 NORTH PDPA5 EAST RIGHT PB5 WEST RIGHT PC5 WEST PDPA6 EAST AMBER PB6 WEST AMBER PC6 SOUTH PDPA7 EAST RED PB7 WEST RED PC7 EAST PD

60

PATH REPRESENTATION:

CONTROL ----- 0F ( FOR 8255 PPI )PORT A ----- 0CPORT B ----- 0DPORT C ----- 0E

61

PROGRAM :


OPERAND

COMMENT

4100 MVI A, 41 3E 41 Move 80 immediately toaccumulator

4102 OUT CONTROL D3 0F Output contents ofaccumulator to OF port

4104 LXI H,DATA_SQ Load address 417B to HLregister

4107 LXI D,DATA_E 11 41,87 Load address 4187 to DEregister

410A CALL OUT CD 42,41 Call out address410D XCHG EB Exchange contents of HL

with DE pair410E MOV A,M 7E Move M content to

accumulator410F OUT PORT A D3 0C Load port A into output port4111 CALL DELAY1 CD 66,41 Call delay address4114 XCHG EB Exchange content of HL

with DE pair4115 INX D 13 Increment the content of D4116 INX H 23 Increment the content of H4117 CALL OUT CD 42,41 Call out the address

411A XCHG EB Exchange content of HLwith DE pair

411B MOV A,M 7E Move M content toaccumulator

411C OUT PORT B D3 0D Load port B into output port411E CALL DELAY1 CD 66,41 Call DELAY address4121 XCHG EB Exchange content of HL

with DE pair4122 INX D 13 Increment D register4123 INX H 23 Increment H register4124 CALL OUT CD 42,41 Call specified address4127 XCHG EB Exchange content of HL

with DE pair4128 MOV A,M 7E Move M content to

accumulator

62

4129 OUT PORT C D3 0E Load port C into output port412B CALL DELAY1 CD 66,41 Call DELAY address412E XCHG EB Exchange content of HL

with DE pair412F INX D 13 Increment D register4130 INX H 23 Increment H register4131 CALL OUT CD 42,41 Call specified address4134 XCHG EB Exchange content of HL

with DE pair4135 MOV A,M 7E Move M content to

accumulator4136 OUT PORT C D3 0E Load port C into output port4138 INX H 23 Increment H register4139 MOV A,M 7E Move M content to

accumulator413A OUT PORT A D3 0C Load port A into output port413C CALL DELAY1 CD 66,41 Call DELAY address413F JMP REPEAT C3 04,41 Jump to specified address4142 MOV A,M 7E Move M content to

accumulator4143 OUT PORT C D3 0E Load port C into output port4145 INX H 23 Increment H register4146 MOV A,M 7E Move M content to

accumulator4147 OUT PORT B D3 0D Load port B into output port4149 INX H 23 Increment H register414A MOV A,M 7E Move M content to

accumulator414B OUT PORT A D3 0C Load port A into output port414D CALL DELAY CD 51,41 Call DELAY address4150 RET C9 Return to accumulator4151 PUSH H E5 Push the register H4152 LXI H,001F 21 1F,00 Load 00 1F in HL register

pair4155 LXI B,FFFF 01 FF,FF Load FF FF in DE register

pair4158 DCX B 0B Decrement B register4159 MOV A,B 78 Move B content to

accumulator415A ORA C B1 OR content of C with

accumulator415B JNZ LOOP C2 58,41 Jump to LOOP if no zero415E DCX H 2B Decrement H register415F MOV A,L 7D Move L content to

accumulator

63

4160 ORA H B4 OR content of H withaccumulator

4161 JNZ L1 C2 55,41 Jump to L1 if no zero4164 POP H E1 Pop the register H4165 RET C9 Return from subroutine

4166 PUSH H E5 Push the register H4167 LXI H,001F 21 1F,00 Load 00 1F in HL register

pair416A LXI B,FFFF 01 FF,FF Load FF FF in DE register

pair416D DCX B 0B Decrement B register416E MOV A,B 78 Move B content to

accumulator416F ORA C B1 OR content of C with

accumulator4170 JNZ LOOP2 C2 6D,41 Jump to LOOP2 if no zero4173 DCX H 2B Decrement H register4174 MOV A,L 7D Move L content to

accumulator4175 ORA H B4 OR content of H with

accumulator4176 JNZ L2 C2 6A,41 Jump to L2 if no zero4179 POP H E1 Pop the register H417A RET C9 Return to subroutine417B DATA

SEQ DB12 27 44 10 2B92 10 9D 84 482E 8448 4B 20 49 04

RESULT:

Thus an assembly language program to simulate the traffic light at an intersection using a

traffic light interfaces was written and implemented.

64

EX.No:6 INTERFACING 8251 WITH 8085

AIM:

To write a program to initiate 8251 and to check the transmission and reception of character.

APPARATUS REQUIRED : 1. 8085 Microprocessor kit

2. 8251 Interface board

3. DC regulated power supply

THEORY:

The 8251 is used as a peripheral device for serial communication and is programmed by the CPU to operate using virtually any serial data transmission technique. The USART accepts data characters from the CPU in parallel format and the converts them in a continuous serial data stream of transmission. Simultaneously, it can receive serial data streams and convert them into parallel data characters for the CPU. The CPU can read the status of USART at any time. These include data transmissions errors and control signals.

Prior to starting data transmission or reception ,the 8251 must be loaded with a set of control words generated by the CPU.These control signals define the complete functional definition of the 8251 and must immediately follow a RESET operation. Control words should be written in to the control register of 8251. words should be written in to the control register of 8251.words should be written in to the control register of 8251.Thesecontrol words are split into two formats.1. MODE INSTRUCTION WORD2. COMMAND INSTRUCTION WORD.

1. MODE INSTRUCTION WORD

This format defines the BAUD rate, character length, parity and stop bits required to work with asynchronous data communication. by selecting the appropriate BAUD factor synchronous mode, the 8251 can be operated in synchronous mode.

Initializing 8251 using the Mode instructions to the following conditions.

8 bit dataNo parityBaud rate factor(16X)1 stop bit

Gives a mode command word of 01001110=4E(X)

65

ALGORITHM1. Initialize timer (8253) IC2. Move the Mode command word (4EH) to A reg.3. Output it port address C24. Move the command instruction word (37H) to A reg.5. Output it to port address C26. Move the data to be transfer to A reg.7. Output it to port address C0.8. Reset the system9. Get the data through input port address C0.10. Store the value in memory11. Reset the system

PROGRAM:

ADDRESS

LABEL

MNEMONICS

OPCODE

OPERAN

D

COMMENT

4100 MVI A 36 Move 36 to A

4102 OUT CE Output contents of accumulator to CEport

4104 MVI A 0A Move 0A to accumulator

4106 OUT C8 Output contents of accumulator to C8port

4108 MVI A 00 Move 00 to accumulator

410A OUT C8 Output contents of accumulator to C8port

410C LXI H 4200 Store 4200 address in HL register pair

410F MVI A 4E Move 4E to accumulator


4113 MVI A 37 Move 37 to accumulator4115 OUT C2 Output contents of accumulator to C2

port4117 MVI A 41 Move 41 to accumulator


411B RST1

4200 IN C0 Input the contents from port C0 toaccumulator

4202 STA 4150 Store the output from accumulator to4150

4205 RST1

66

SYNCHRONOUS MODE:

S2 S1 EP PEN L2 L1 B2 B1

0

0

1

0

0

1

1

1

5BIT

6BIT

7BIT

8BIT

PARITY ENABLE 1-Enable0-Disable

EVEN PARITY GENERATION 0-Odd1-Even

EXTERNAL SYNC DETECT 1-Sysdetect is an input0- Sysdetect is an output

SINGLE CHARACTER SYNC 1-Single sync character0- Double sync character

67

ASYNCHRONOUS MODE:

S2 S1 EP PEN L2 L1 B2 B1

0 1 0 1

0 0 1 1

Synchmode

(1 X) (16 X) (64 X)

0 1 0 1

0 0 1 1

5BIT

6BIT

7BIT

8BIT

PARITY ENABLE 1-Enable0-Disable

EVEN PARITY GENERATION 0-Odd1-Even

0 1 0 1

0 0 1 1

Invalid 61BIT 1.5BIT 2 BIT

68

OBSERVATION:

MEMORY LOCATION INPUT DATA OUTPUT DATA

RESULT:

Thus the program to initiate 8251 was written and the transmission and reception of character was checked by interfacing 8251 with 8085.

69

EXPT.NO.7 7. INTERFACING 8253 TIMER WITH 8085

AIM : To interface 8253 Interface board to 8085 microprocessor to demonstrate the generation of

square wave.

APPARATUS REQUIRED : 1. 8085 microprocessor kit

2. 8253 Interface board

3. DC regulated power supply

4. CRO.

PROGRAM:

Addres Opcodes Label Mnemoni Operands Comments4100 3E 36 START: MVI A, 36 Channel 0 in mode 34102 D3 CE OUT CE Send Mode Control word4104 3E 0A MVI A, 0A LSB of count4106 D3 C8 OUT C8 Write count to register4108 3E 00 MVI A, 00 MSB of count410A D3 C8 OUT C8 Write count to register410C 76 HLT

Set the jumper, so that the clock 0 of 8253 is given a square wave of frequency 1.5 MHz. This program divides this PCLK by 10 and thus the output at channel 0 is 150 KHz.

Vary the frequency by varying the count. Here the maximum count is FFFF H. So, the square wave will remain high for 7FFF H counts and remain low for 7FFF H counts. Thus with the input clock frequency of 1.5 MHz, which corresponds to a period of 0.067 microseconds, the resulting square wave has an ON time of 0.02184 microseconds and an OFF time of 0.02184 microseconds.

To increase the time period of square wave, set the jumpers such that CLK2 of 8253 is connected to OUT 0. Using the above-mentioned program, output a square wave of frequency 150 KHz at channel 0. Now this is the clock to channel 2.

70

CONTROL WORD:

SC1 SC2 RW1 RW0 M2 M1 M0 BCD

SC-SELECT COUNTER:

SC1 SC0 SELECT COUNTER

0 0 Select counter 0



1 1 Read back command

M-MODE:

M2 M1 M0 MODE0 0 0 Mode 00 0 1 Mode 1X 1 0 Mode 2X 1 1 Mode 31 0 0 Mode 4

1 0 1 Mode 5

READ/WRITE:

RW1 RW0

0 0 Counter latch command

0 1 R/W least significant bit only

1 0 R/W most significant bit only

1 1 R/W least sig first and most sig byte

BCD:

0 Binary counter 16-bit

1 Binary coded decimal counter

71

Result:Thus the 8253 has been interfaced to 4185 p and six different modes of 8253 have

been studied.

72

EXPT. NO 8 INTERFACING 8279 WITH 8085

AIM:To interface 8279 Programmable Keyboard Display Controller to 8085 Microprocessor.

APPARATUS REQUIRED:

1. 8085 Microprocessor toolkit.2. 8279 Interface board3. Regulated D.C. power supply.

PROGRAM:


OPERAND

COMMENT

4100 START LXI H 4130 Store the 16 bit addressin HL pair

4103 MVI D 0F Move 0F to D register

4105 MVI A 10 Move 10 to A

4107 OUT C2 Output the contents ofA to C2 output port

4109 MVI A CC Move CC to A

410B OUT C2 Output the contents ofA to C2 output port

410D MVI A 90 Move 90 to A

410F OUT C2 Output the contents ofA to C2 output port

4111 LOOP MOV A, M Move content of M toA

4112 OUT C0 Output the contents ofM to A

4114 CALL DELAY DELAY Call the delay address

4117 INX H Increment H register

4118 DCR D Decrement D register

73

4119 JNZ LOOP LOOP Jump to specifiedaddress

411C JMP START START Jump to STARTaddress

411F DELAY MVI B A0 Move a to B register

4121 LOOP1 MVI C FF Move FF to C register

4123 LOOP2 DCR C Decrement C register

4124 JNZ LOOP 1 LOOP 1 Jump to LOOP 1 if nozero

4127 DCR B Decrement B register

4128 JNZ LOOP 2 LOOP 2 Jump to LOOP 2 if nozero

412B RET

Pointer equal to 4130 .FF repeated eight times

4130 FF4131 FF4132 FF4133 FF4134 FF4135 FF4136 FF4137 FF4138 984139 68413ª 7C413B C8413C 1C413D 29413E FF413F FF

74

SEGMENT DEFINITION:

DATA BUS D7 D6 D5 D4 D3 D2 D1 D0

SEGMETS d c b a dp g f e

OBSERVATION:

LETTER 7SEGMENT

DATA BUSHEXADECIMAL

D7 D6 D5 D4 D3 D2 D1 D0

RESULT:

Thus 8279 controller was interfaced with 8085 and program for rolling display was executed successfully.

75

MICROCONTROLLER

76

Ex.No:9 9. 8051 - SUM OF ELEMENTS IN AN ARRAY

AIM:

To find the sum of elements in an array.

ALGORITHM:

1. Load the array in the consecutive memory location and initialize the

memory pointer with the starting address.

2. Load the total number of elements in a separate register as a counter.

3. Clear the accumulator.

4. Load the other register with the value of the memory pointer.

5. Add the register with the accumulator.

6. Check for carry, if exist, increment the carry register by 1. otherwise,

continue

7. Decrement the counter and if it reaches 0, stop. Otherwise increment the

memory pointer by 1 and go to step 4.

77

PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENT4100 MOV DPTR, #4200

4103 MOVX A, @DPTR

4104 MOV R0, A

4105 MOV B, #00

4108 MOV R1, B

410A ADD CLR C C3

410B INC DPTR A3

410C MOVX A, @DPTR

410D ADD A, B

410F MOV B, A

4111 JNC NC

4113 INC R1

4114 NC INC DPTR

4116 MOV DPTR, #4500

4119 MOV A, R1

411A MOVX @DPTR, A

411B INC DPTR

411C MOV A, B

411E MOVX @DPTR, A

411F SJMP HLT

78

OBSERVATION:

INPUT OUTPUT

4200 4500

4201

4202

45014203

RESULT:

The sum of elements in an array is calculated.

79

EXPT.NO.10. 10. 8051 - SUM USING STACK

AIM:

To find the sum of elements in an array using stack.

ALGORITHM:

1. Start

2. Move the data to stack pointer

3. Move the data to accumulator

4. Move the data to reg B

5. Move the data to DPL

6. Push the value of A to stack

7. Push the value of B to stack

8. Push the value of DPL to stack

9. Halt

80

PROGRAM:

ADDRESS OPCODE LABEL MNEMONICS OPERAND COMMENT4100 MOV SP, #67 67

4103 MOV A, #88 88

4105 MOV B, #66 66

4108 MOV DPL, #43 43

410B PUSH A

410D PUSH B

410F PUSH DPL

4111 SJMP

RESULT:

The sum of elements in an array is calculated.

81

EXPT.NO.11 11. 8051 - SUM USING CALL OPTION

AIM:

To find the sum of elements in an array using call option.

ALGORITHM:

1. Start

2. Move the data to DPTR


4. Adjacent call 4200

5. Add A & R0

6. Move the 16 bit data from A to DPTR


8. Move the data to R0

9. Return to 4107

82

PROGRAM:

ADDRESS OPCODE

LABEL MNEMONICS OPERAND COMMENT

4100 MOV DPTR,# 4300 43,00

4103 MOV A, # 00 00

4105 ACALL 4200 42,00

4108 ADD A, R0

410B MOVX @DPTR,A 80

410D SJMP

410F MOVA,#02 02

4111 MOV R0, #01 01

RET

OBSERVATION:

INPUT OUTPUT

4200 4300

4202

RESULT:

The sum of elements in an array using call option is calculated is calculated.

83

Ex.No:12 12 STEPPER MOTOR INTERFACING WITH 8051

AIM:To interface a stepper motor with 8051 microcontroller and operate it.

THEORY:A motor in which the rotor is able to assume only discrete stationary angular position is a

stepper motor. The rotary motion occurs in a step-wise manner from one equilibrium position to the next. Stepper Motors are used very wisely in position control systems like printers, disk drives, process control machine tools, etc.

The basic two-phase stepper motor consists of two pairs of stator poles. Each of the four poles has its own winding. The excitation of any one winding generates a North Pole. A South Pole gets induced at the diametrically opposite side. The rotor magnetic system has two end faces. It is a permanent magnet with one face as South Pole and the other as North Pole.

The Stepper Motor windings A1, A2, B1, B2 are cyclically excited with a DC current to run the motor in clockwise direction. By reversing the phase sequence as A1, B2, A2, B1, anticlockwise stepping can be obtained.

2-PHASE SWITCHING SCHEME:In this scheme, any two adjacent stator windings are energized. The switching scheme

is shown in the table given below. This scheme produces more torque.

ANTICLOCKWISE CLOCKWISE

STEP A1 A2 B1 B2 DATA STEP A1 A2 B1 B2 DATA1 1 0 0 1 9h 1 1 0 1 0 Ah2 0 1 0 1 5h 2 0 1 1 0 6h3 0 1 1 0 6h 3 0 1 0 1 5h4 1 0 1 0 Ah 4 1 0 0 1 9h

ADDRESS DECODING LOGIC:The 74138 chip is used for generating the address decoding logic to generate the device

select pulses, CS1 & CS2 for selecting the IC 74175.The 74175 latches the data bus to the stepper motor driving circuitry.

Stepper Motor requires logic signals of relatively high power. Therefore, the interface circuitry that generates the driving pulses use silicon darlington pair transistors. The inputs for the interface circuit are TTL pulses generated under software control using the Microcontroller Kit. The TTL levels of pulse sequence from the data bus is translated to high voltage output pulses using a buffer 7407 with open collector.

84

BLOCK DIAGRAM:

8051MICROCONTROLLER

REPRESENTATION:

8255DRIVER CIRCUIT STEPPER MOTOR

85

PROGRAM :

Address

OPCODES LabelMNEMONICS OPERAND Comments

ORG 4100h

4100 START MOV DPTR, #TABLE Load the start addressof switching schemedata TABLE into DataPointer (DPTR)

4103 MOV R0, #04 Load the count in R04105 LOOP: MOVX A, @DPTR Load the number in

TABLE into A4106 PUSH DPH Push DPTR value to

Stack4108 PUSH DPL410A MOV DPTR, #0FFC0h Load the Motor port

address into DPTR410D MOVX @DPTR, A Send the value in A to

stepper Motor portaddress

410E MOV R4, #0FFh Delay loop to cause aspecific amount oftime delay before nextdata item is sent to theMotor

4110 DELAY:

MOV R5, #0FFh

4112 DELAY1:

DJNZ R5, DELAY1

4114 DJNZ R4, DELAY4116 POP DPL POP back DPTR value

from Stack4118 POP DPH411A INC DPTR Increment DPTR to

point to next item inthe table

411B DJNZ R0, LOOP Decrement R0, if notzero repeat the loop

411D SJMP START Short jump to Start ofthe program to makethe motor rotatecontinuously

411F TABLE:

DB 09 05 06 0Ah Values as per two-phase switchingscheme

86

PROCEDURE:1. Enter the above program starting from location 4100.and execute the same.2. The stepper motor rotates.3. Varying the count at R4 and R5 can vary the speed.4. Entering the data in the look-up TABLE in the reverse order can vary direction of rotation.

RESULT:Thus a stepper motor was interfaced with 8051 and run in forward and reverse

directions at various speeds.

87

EX.NO 13. INTERFACING D/A CONVERTER WITH 8051

AIM:To interface DAC with 8051 to demonstrate the generation of square, saw tooth and

triangular wave.

APPARATUS REQUIRED:

SL.NO ITEM SPECIFICATION QUANTITY1 Microprocessor kit 4185,Vi Microsystems 12 Power supply +5 V dc 13 DAC Interface board Vi Microsystems 1

THEORY:

SOFTWARE EXAMPLES

After going through the software examples you can learn how to control the DAC using 8051 and generate sine wave, saw tooth wave etc by means of software.

ALGORITHM:

(a) SQUARE WAVE GENERATION:1. Load the initial value (00) to Accumulator and move it to DAC.2. Call the delay program3. Load the final value (FF) to accumulator and move it to DAC.4. Call the delay program.5. Repeat steps 2 to 5.

88

DAC - CIRCUIT:

WAVEFORMS:

89

OBSERVATION:


PROGRAM:The basic idea behind the generation of waveforms is the continuous generation of

Analog output of DAC.With 00(HEX) as input to DAC2, the analog output is -5V. Similarly, with FF (Hex) as

input, the output is +5V. Outputting digital data 00 and FF at regular intervals, to DAC2, results in a square wave of amplitude I5 Volts.

ADDRESS LABEL MNEMON ICS OPCODE OPERAND COMMENTMOV DPTR,#FFC8

START MOV A,#00MOVX @DPTR,ALCALL DELAYMOV A,# FFMOVX @DPTR,ALCALL DELAYLJMP START

DELAY MOV R1,#05LOO[P MOV R2,#FF

DJNZ R2,HEREDJNZ R1,LOOPRETSJMP START

Execute the program and using a CRO, verify that the waveform at the DAC2 output is a square-wave. Modify the frequency of the square-wave, by varying the time delay.

(b) SAW TOOTH GENERATION1. Load the initial value (00) to Accumulator2. Move the accumulator content to DAC.3. Increment the accumulator content by 1.4. Repeat steps 3 and 4.

Output digital data from 00 to FF constant steps of 01 to DAC1 repeat this sequence again and again. As a result a saw - tooth wave will be generated at DAC1 output.

90

PROGRAM:

ADDRESS LABEL MNEMON ICS OPCODE OPERAND COMMENTMOV DPTR,#FFC0MOV A,#00

LOOP MOVX @DPTR,AINC ASJMP LOOP

(c) TRIANGULAR WAVE GENERATION1. Load the initial value (00) to Accumulator.2. Move the accumulator content to DAC3. Increment the accumulator content by 1.4. If accumulator content is zero proceed to next step. Else go to step 3.5. Load value (FF) to accumulator.6. Move the accumulator content to DAC.7. Decrement the accumulator content by 1.8. If accumulator content is zero go to step 2. Else go to step 2.

The following program will generate a triangular wave at DAC2 output. The program is self explanatory.

ADDRESS LABEL MNEMON ICS OPCODE OPERAND COMMENTMOV DPTR,#FFC8

START MOV A,#00LOOP1 MOVX @DPTR,A

INC AJNZ LOOP1MOV A,#FF

LOOP2 MOVX @DPTR,ADEC AJNZ LOOP2LJMP START

OBSERVATION:


91

Result:Thus the square, triangular and saw tooth wave form were generated by interfacing

DAC with 8051 trainer kit.

92

Ex. No: 14 STUDY OF BASIC DIGITAL ICS

AIM:

To verify the truth table of basic digital ICs of AND, OR, NOT, NAND, NOR, EX-ORgates.

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity

1. Digital IC trainer kit 1

2. AND gate IC 7408 1

3. OR gate IC 7432 1

4. NOT gate IC 7404 1

5. NAND gate IC 7400 1

6. NOR gate IC 7402 1

7. EX-OR gate IC 7486 1

8. Connecting wires As required

THEORY:

a. AND gate:

An AND gate is the physical realization of logical multiplication operation. It is an electronic circuit which generates an output signal of ‘1’ only if all the input signals are ‘1’.

b. OR gate:

An OR gate is the physical realization of the logical addition operation. It is an electronic circuit which generates an output signal of ‘1’ if any of the input signal is ‘1’.

c. NOT gate:

A NOT gate is the physical realization of the complementation operation. It is an electronic circuit which generates an output signal which is the reverse of the input signal. A NOT gate is also known as an inverter because it inverts the input.

93

d. NAND gate:

A NAND gate is a complemented AND gate. The output of the NAND gate will be ‘0’ if all the input signals are ‘1’ and will be ‘1’ if any one of the input signal is ‘0’.

e. NOR gate:

A NOR gate is a complemented OR gate. The output of the OR gate will be ‘1’ if all the inputs are ‘0’ and will be ‘0’ if any one of the input signal is ‘1’.

f. EX-OR gate:

An Ex-OR gate performs the following Boolean function,

A B = ( A . B’ ) + ( A’ . B )

It is similar to OR gate but excludes the combination of both A and B being equal to one. The exclusive OR is a function that give an output signal ‘0’ when the two input signals are equal either ‘0’ or ‘1’.

PROCEDURE:

1. Connections are given as per the circuit diagram1. For all the ICs 7th pin is grounded and 14th pin is given +5 V supply.2. Apply the inputs and verify the truth table for all gates.

AND GATE

LOGIC DIAGRAM:

94

PIN DIAGRAM OF IC 7408:

CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A B Y = A . B1. 0 0 02. 0 1 03. 1 0 04. 1 1 1

OR GATE

LOGIC DIAGRAM:

95

PIN DIAGRAM OF IC 7432 :

CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A B Y = A + B1. 0 0 02. 0 1 13. 1 0 14. 1 1 1

NOT GATE

LOGIC DIAGRAM:

96


CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A Y = A’1. 0 12. 1 0

NAND GATE

LOGIC DIAGRAM:

97


CIRCUIT DIARAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A B Y = (A. B)’1. 0 0 12. 0 1 13. 1 0 14. 1 1 0

98

NOR GATE

LOGIC DIAGRAM:


CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A B Y = (A + B)’1. 0 0 12. 0 1 03. 1 0 04. 1 1 0

99

EX-OR GATE

LOGIC DIAGRAM


CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoINPUT OUTPUT

A B Y = A B1. 0 0 02. 0 1 13. 1 0 14. 1 1 0

100

RESULT:

The truth tables of all the basic digital ICs were verified.

101

EX.NO.15 DESIGN AND IMPLEMENTATION OF ADDER/SUBTRACTOR

AIM:

To design and construct half adder, full adder, half subtractor and full subtractor

circuits and verify the truth table using logic gates.

APPARATUS REQUIRED:

S. No Name Specification Quantity

1. IC 7432, 7408, 7486, 7483 1

2. Digital IC Trainer Kit 1

3. Patch chords -

THEORY:

The most basic arithmetic operation is the addition of two binary digits. There are four possible elementary operations, namely,

0 + 0 = 00 + 1 = 11 + 0 = 11 + 1 = 102

The first three operations produce a sum of whose length is one digit, but when the last operation is performed the sum is two digits. The higher significant bit of this result is called a carry and lower significant bit is called the sum.

HALF ADDER:

A combinational circuit which performs the addition of two bits is called half adder. The input variables designate the augend and the addend bit, whereas the output variables produce the sum and carry bits.

FULL ADDER:

A combinational circuit which performs the arithmetic sum of three input bits is called full adder. The three input bits include two significant bits and a previous carry bit. A full adder circuit can be implemented with two half adders and one OR gate.

102

HALF ADDER

TRUTH TABLE:

S.NoINPUT OUTPUT

A B S C1. 0 0 0 02. 0 1 1 03. 1 0 1 04. 1 1 0 1

DESIGN:

From the truth table the expression for sum and carry bits of the output can beobtained as, Sum, S = A B ; Carry, C = A . B

CIRCUIT DIAGRAM:

FULL ADDER

TRUTH TABLE:

S.NoINPUT OUTPUT

A B C SUM CARRY1. 0 0 0 0 02. 0 0 1 1 03. 0 1 0 1 04. 0 1 1 0 15. 1 0 0 1 06. 1 0 1 0 17. 1 1 0 0 18. 1 1 1 1 1

103

DESIGN:

From the truth table the expression for sum and carry bits of the output can be obtained as,SUM = A’B’C + A’BC’ + AB’C’ + ABC;CARRY = A’BC + AB’C + ABC’ +ABC Using Karnaugh maps the reduced expression for the output bits can be obtained as,

SUM

SUM = A’B’C + A’BC’ + AB’C’ + ABC = A B C

CARRY

CARRY = AB + AC + BC

CIRCUIT DIAGRAM:

104

HALF SUBTRACTOR:

A combinational circuit which performs the subtraction of two bits is called half subtractor. The input variables designate the minuend and the subtrahend bit, whereas the output variables produce the difference and borrow bits.

FULL SUBTRACTOR:

A combinational circuit which performs the subtraction of three input bits is called full subtractor. The three input bits include two significant bits and a previous borrow bit. A full subtractor circuit can be implemented with two half subtractors and one OR gate.

HALF SUBTRACTOR

TRUTH TABLE:

S.NoINPUT OUTPUT

A B DIFF BORR1. 0 0 0 02. 0 1 1 13. 1 0 1 04. 1 1 0 0

DESIGN:

From the truth table the expression for difference and borrow bits of the output can be obtained as, Difference, DIFF = A B; Borrow, BORR = A’ . B

CIRCUIT DIAGRAM:

105

FULL SUBTRACTORTRUTH TABLE:

S.NoINPUT OUTPUT

A B C DIFF BORR1. 0 0 0 0 02. 0 0 1 1 13. 0 1 0 1 14. 0 1 1 0 15. 1 0 0 1 06. 1 0 1 0 07. 1 1 0 0 08. 1 1 1 1 1

DESIGN:

From the truth table the expression for difference and borrow bits of the output can be obtained as,

Difference, DIFF= A’B’C + A’BC’ + AB’C’ + ABC Borrow, BORR = A’BC + AB’C + ABC’ +ABC

Using Karnaugh maps the reduced expression for the output bits can be obtained as,

DIFFERENCE

DIFF = A’B’C + A’BC’ + AB’C’ + ABC = A B C

BORROW

BORR = A’B + A’C + BC

106

CIRCUIT DIAGRAM:

PROCEDURE:

The connections are given as per the circuit diagram. Two 4 - bit numbers added or subtracted depend upon the control input and the

output is obtained. Apply the inputs and verify the truth table for thehalf adder or s subtractor and

full adder or subtractor circuits.

RESULT:

Thus the half adder, full adder, half subtractor and full subtractor circuits were designed and their truth table were verified.

107

EX.NO.16 CODE CONVERTER

AIM:

To construct and verify the performance of binary to gray and gray to binary.

APPARATUS REQUIRED:


1. IC 7404, 7486 1


3. Patch chords -

THEORY:

BINARY TO GRAY:

The MSB of the binary code alone remains unchanged in the Gray code. The remaining

bits in the gray are obtained by EX-OR ing the corresponding gray code bit and previous bit in

the binary code. The gray code is often used in digital systems because it has the advantage

that only one bit in the numerical representation changes between successive numbers.

GRAY TO BINARY:

The MSB of the Gray code remains unchanged in the binary code the remaining bits are

obtained by EX - OR ing the corresponding gray code bit and the previous output binary bit.

PROCEDURE:

Connections are given as per the logic diagram.

The given truth tables are verified.

108

BINARY TO GRAY:

GRAY TO BINARY

109

TRUTH TABLE

Decimal Binary code Gray code

D C B A G3 G2 G1 GO

0 0 0 0 0 0 0 0 01 0 0 0 1 0 0 0 12 0 0 1 0 0 0 1 13 0 0 1 1 0 0 1 04 0 1 0 0 0 1 1 05 0 1 0 1 0 1 1 16 0 1 1 0 0 1 0 17 0 1 1 1 0 1 0 08 1 0 0 0 1 1 0 09 1 0 0 1 1 1 0 110 1 0 1 0 1 1 1 111 1 0 1 1 1 1 1 0

12 1 1 0 0 1 0 1 013 1 1 0 1 1 0 1 114 1 1 1 0 1 0 0 115 1 1 1 1 1 0 0 0

RESULT:

The design of the three bit Binary to Gray code converter & Gray to Binary code

converter circuits was done and its truth table was verified.

110

EX.NO.17 ENCODER

AIM:

To design and implement encoder using IC 74148 (8-3 encoder)

APPARATUS REQUIRED:


1. IC 74148 1


3. Patch chords -

THEORY:

An encoder is digital circuit that has 2n input lines and n output lines. The output lines

generate a binary code corresponding to the input values 8 - 3 encoder circuit has 8 inputs, one

for each of the octal digits and three outputs that generate the corresponding binary number.

Enable inputs E1 should be connected to ground and Eo should be connected to VCC

PROCEDURE:


The truth table is verified by varying the inputs.

PIN DIAGRAM

1

2N INPUT 2

N-12

2N

1

ENCODER

2

N OUTPUT

N

111

TRUTH TABLE

E1

INPUTS OUTPUTSA0 A1 A2 A3 A4 A5 A6 A7 D2 D1 D0

0 0 1 1 1 1 1 1 1 0 0 00 1 0 1 1 1 1 1 1 0 0 10 1 1 0 1 1 1 1 1 0 1 00 1 1 1 0 1 1 1 1 0 1 10 1 1 1 1 0 1 1 1 1 0 00 1 1 1 1 1 0 1 1 1 0 10 1 1 1 1 1 1 0 1 1 1 00 1 1 1 1 1 1 1 0 1 1 11 1 1 1 1 1 1 1 1 1 1 1

112

EX.NO.18 DECODERAIM:

To design and implement decoder using IC 74155 (3-8 decoder).

APPARATUS REQUIRED:


1. IC 74155 1


3. Patch chords -

THEORY:

A decoder is a combinational circuit that converts binary information from n input lines

to 2n unique output lines.

In 3-8 line decoder the three inputs are decoded into right outputs in which each output

representing one of the minterm of 3 input variables. IC 74155 can be connected as a dual 2*4

decoder or a single 3*8 decoder desired input in C1 and C2 must be connected together and used

as the C input. G1 and G2 should be connected and used as the G (enable) input. G is the

enable input and must be equal to 0 for proper operation.

PROCEDURE:


The truth table is verified by varying the inputs.

CIRCUIT DIAGRAM:

1

N INPUT 2

N

DECODER

1

2 N OUTPUT

2N-1

2N

113

TRUTH TABLE

INPUTS OUTPUTS

G C B A 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3

1 X X X 1 1 1 1 1 1 1 10 0 0 0 0 1 1 1 1 1 1 10 0 0 1 1 0 1 1 1 1 1 10 0 1 0 1 1 0 1 1 1 1 10 0 1 1 1 1 1 0 1 1 1 10 1 0 0 1 1 1 1 0 1 1 10 1 0 1 1 1 1 1 1 0 1 10 1 1 0 1 1 1 1 1 1 0 10 1 1 1 1 1 1 1 1 1 1 0

RESULT:

Thus the encoder and decoder circuits were designed and implemented.

114

EX.NO.19 STUDY OF FLIP FLOPS

AIM:

To verify the characteristic table of RS, D, JK, and T Flip flops .

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity1. Digital IC trainer kit 12. NOR gate IC 74023. NOT gate IC 74044. AND gate ( three input ) IC 74115. NAND gate IC 74006. Connecting wires As required

THEORY:

A Flip Flop is a sequential device that samples its input signals and changes its output states only at times determined by clocking signal. Flip Flops may vary in the number of inputs they possess and the manner in which the inputs affect the binary states.

RS FLIP FLOP:

The clocked RS flip flop consists of NAND gates and the output changes its state with respect to the input on application of clock pulse. When the clock pulse is high the S and R inputs reach the second level NAND gates in their complementary form. The Flip Flop is reset when the R input high and S input is low. The Flip Flop is set when the S input is high and R input is low. When both the inputs are high the output is in an indeterminate state.

D FLIP FLOP:

To eliminate the undesirable condition of indeterminate state in the SR Flip Flop when both inputs are high at the same time, in the D Flip Flop the inputs are never made equal at the same time. This is obtained by making the two inputs complement of each other.

JK FLIP FLOP:

The indeterminate state in the SR Flip-Flop is defined in the JK Flip Flop. JK inputs behave like S and R inputs to set and reset the Flip Flop. The output Q is ANDed with K input and the clock pulse, similarly the output Q’ is ANDed with J input and the Clock pulse. When the clock pulse is zero both the AND gates are disabled and the Q and Q’ output retain their previous values. When the clock pulse is high, the J and K inputs reach the NOR gates. When both the inputs are high the output toggles continuously. This is called Race around condition and this must be avoided.T FLIP FLOP:

115

This is a modification of JK Flip Flop, obtained by connecting both inputs J and K inputs together. T Flip Flop is also called Toggle Flip Flop.

RS FLIP FLOP

LOGIC SYMBOL:

CIRCUIT DIAGRAM:

CHARACTERISTIC TABLE:

CLOCKPULSE

INPUT PRESENTSTATE (Q)

NEXTSTATE(Q+1)

STATUSS R

1 0 0 0 02 0 0 1 13 0 1 0 04 0 1 1 05 1 0 0 16 1 0 1 17 1 1 0 X8 1 1 1 X

D FLIP FLOP

116

LOGIC SYMBOL:

CIRCUIT DIAGRAM:


CLOCKPULSE

INPUTD

PRESENTSTATE (Q)

NEXTSTATE(Q+1)

STATUS

1 0 0 0

2 0 1 0

3 1 0 1

4 1 1 1

117

JK FLIP FLOP

LOGIC SYMBOL:

CIRCUIT DIAGRAM:


CLOCKPULSE

INPUT PRESENTSTATE (Q)

NEXTSTATE(Q+1)

STATUSJ K

1 0 0 0 02 0 0 1 13 0 1 0 04 0 1 1 05 1 0 0 16 1 0 1 17 1 1 0 18 1 1 1 0

118

T FLIP FLOP

LOGIC SYMBOL:

CIRCUIT DIAGRAM:


CLOCKPULSE

INPUTT

PRESENTSTATE (Q)

NEXTSTATE(Q+1)

STATUS

1 0 0 02 0 1 03 1 0 14 1 1 0

119

PROCEDURE:

1. Connections are given as per the circuit diagrams.2. For all the ICs 7th pin is grounded and 14th pin is given +5 V supply.3. Apply the inputs and observe the status of all the flip flops.

RESULT:

The Characteristic tables of RS, D, JK, T flip flops were verified.

120

EX.NO.20 ASYNCHRONOUS COUNTER

AIM:

To implement and verify the truth table of an asynchronous decade counter.

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity1. Digital IC trainer kit 12. JK Flip Flop IC 7473 24. NAND gate IC 7400 15. Connecting wires As required

THEORY:

Asynchronous decade counter is also called as ripple counter. In a ripple counter the flip flop output transition serves as a source for triggering other flip flops. In other words the clock pulse inputs of all the flip flops are triggered not by the incoming pulses but rather by the transition that occurs in other flip flops. The term asynchronous refers to the events that do not occur at the same time. With respect to the counter operation, asynchronous means that the flip flop within the counter are not made to change states at exactly the same time, they do not because the clock pulses are not connected directly to the clock input of each flip flop in the counter.


121

CIRCUIT DIAGRAM:

TRUTH TABLE:

S.NoCLOCKPULSE

OUTPUTD(MSB) C B A(LSB)

1 - 0 0 0 02 1 0 0 0 13 2 0 0 1 04 3 0 0 1 15 4 0 1 0 06 5 0 1 0 17 6 0 1 1 08 7 0 1 1 19 8 1 0 0 010 9 1 0 1 011 10 0 0 0 0

PROCEDURE:

1. Connections are given as per the circuit diagrams.2. Apply the input and verify the truth table of the counter.

122

RESULT:

The truth table of the Asynchronous counter was hence verified.

123

EX.NO.21 SHIFT REGISTERS

AIM:To implement the following shift register using flip flop

(i) SIPO

(ii) SISO

(iii) PISO

(iv) PIPO

APPARATUS REQUIRED:


1. IC 7474 1


3. Patch chords -

THEORY:

A register is used to move digital data. A shift register is a memory in which

information is shifted from one position in to another position at a line when one clock pulse is

applied. The data can be shifted either left or right direction towards right or towards left.

A shift register can be used in four ways depending upon the input in which the data are

entered in to and takes out of it. The four configuration are given as

Serial input - Serial output

Parallel input - Serial output

Serial input - Parallel output

Parallel input - Parallel output

RS or JK flip flop are used to construct shift register have D flip flop is used for

constructing shift register.

PROCEDURE:

Give the connections as per the circuit

Set or Reset at the pin 2 which it’s the MSB of serial data.

Apply a single clock Set or Reset second digital input at pin 2.

Repeat step 2 until all 4-bit data are taken away.

124

SHIFT REGISTER:_

+5VCC CLR2 D2 CLK PR2 Q2 Q2

14 13 12 11 10 9 8

IC 7474

1 2 3 4 5 6 7

_CLR1 D1 CLK PR1 Q 1 Q1 GND

SIPO LEFT SHIFTQ3

+5VCC

9

Q2

10 412 5 2

IC 7474 IC 7474

11 313 1

Q1

109 12

IC 7474

1113

Q0

45 2 D IN

IC 7474

31

+5VCC

CLK

SIPO RIGHT SHIFT

125

SISO

DOUT

+5VCC

10 412 5 2 9

9

10 412 5 2 DIN

IC 747411

13

PIPO

Q2

D

SISOData input = 1100

IC 7474 IC 7474

31 13

Q1

C

IC 747411 3

1

+5VCC

CLK

Q0

B A

Clock Serial input Serial output0 0 04 1 18 1 112 0 016 0 0

126

PIPO

Clock Parallel input Parallel output

A B C D QA QB QC QD

0 0 0 0 0 0 0 0 0

1 1 1 0 1 1 1 0 1

SIPOLeft shift

No of clk pulse Serial input Din Parallel output

Q3 Q2 Q1 Q0

0 0 0 0 0 0

1 1 0 0 0 1

2 1 0 0 1 1

3 0 0 1 1 0

4 1 1 1 0 1

5 0 1 0 1 0

6 0 0 1 0 0

7 0 1 0 0 0

8 0 0 0 0 0

Right Shift

No of clock pulse Serial input Din Parallel output

Q3 Q2 Q1 Q0

0 0 0 0 0 0

1 1 1 0 0 0

2 1 0 1 0 0

3 0 1 0 1 0

4 1 1 1 0 1

5 0 0 1 1 0

6 0 0 0 1 1

7 0 0 0 0 1

8 0 0 0 0 0

127

RESULT:

Thus the SISO, SIPO, PISO, PIPO shift registers were designed and implemented.

128

EX.NO.22 DIFFERENTIATOR

AIM:To design a Differentiator circuit for the given specifications using Op-Amp IC 741.

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity1. Function Generator 3 MHz 12. CRO 30 MHz 13. Dual RPS 0 - 30 V 14. Op-Amp IC 741 15. Bread Board 16. Resistors7. Capacitors8. Connecting wires and probes As required

THEORY:The differentiator circuit performs the mathematical operation of differentiation; that is,

the output waveform is the derivative of the input waveform. The differentiator may be constructed from a basic inverting amplifier if an input resistor R1 is replaced by a capacitor C1.

The expression for the output voltage is given as, Vo = - Rf C1 (dVi /dt)Here the negative sign indicates that the output voltage is 1800 out of phase with the

input signal. A resistor Rcomp = Rf is normally connected to the non-inverting input terminal of the op-amp to compensate for the input bias current. A workable differentiator can be designed by implementing the following steps:

1. Select fa equal to the highest frequency of the input signal to be differentiated. Then, assuming a value of C1 < 1 µF, calculate the value of Rf.

2. Choose fb = 20 fa and calculate the values of R1 and Cf so that R1C1 = Rf Cf.3. The differentiator is most commonly used in waveshaping circuits to detect high

frequency components in an input signal and also as a rate-of-change detector in FM modulators.

PIN DIAGRAM:

129

CIRCUIT DIAGRAM OF DIFFERENTIATOR:

DESIGN:Given fa = ---------------We know the frequency at which the gain is 0 dB, fa = 1 / (2π Rf C1) Let us assume C1 = 0.1 µF; thenRf = _________Since fb = 20 fa, fb = ---------------We know that the gain limiting frequency fb = 1 / (2π R1 C1) Hence R1 = _________Also since R1C1 = Rf Cf ; Cf = _________

PROCEDURE:1. Connections are given as per the circuit diagram.2. + Vcc and - Vcc supply is given to the power supply terminal of the Op-Amp IC.3. By adjusting the amplitude and frequency knobs of the function generator, appropriate

input voltage is applied to the inverting input terminal of the Op-Amp.4. The output voltage is obtained in the CRO and the input and output voltage waveforms

are plotted in a graph sheet.

130

Am

plit

ude

Am

plit

ude

OBSERVATIONS:Input - Sine wave

S.No. Amplitude Time period( No. of div x Volts per div ) ( No. of div x Time per div )

InputOutput

Input - Square waveS.No. Amplitude Time period

( No. of div x Volts per div ) ( No. of div x Time per div )Input Output

DIFFERENTIATOR:

INPUT SIGNAL:

Time Period

OUTPUT SIGNAL:

Time Period

131

RESULT:

The design of the Differentiator circuit was done and the input and output waveforms were obtained.

132

EX.NO.23 INTEGRATOR

AIM:

To design an Integrator circuit for the given specifications using Op-Amp IC 741.

APPARATUS REQUIRED:S.No Name of the Apparatus Range Quantity

1. Function Generator 3 MHz 12. CRO 30 MHz 13. Dual RPS 0 - 30 V 14. Op-Amp IC 741 15. Bread Board 16. Resistors7. Capacitors8. Connecting wires and probes As required

THEORY:A circuit in which the output voltage waveform is the integral of the input voltage

waveform is the integrator. Such a circuit is obtained by using a basic inverting amplifier configuration if the feedback resistor Rf is replaced by a capacitor Cf . The expression for the output voltage is given as,

Vo = - (1/Rf C1) ∫ Vi dtHere the negative sign indicates that the output voltage is 1800 out of phase with the

input signal. Normally between fa and fb the circuit acts as an integrator. Generally, the value of fa < fb . The input signal will be integrated properly if the Time period T of the signal is larger than or equal to Rf Cf. That is,

T ≥ Rf Cf

The integrator is most commonly used in analog computers and ADC and signal-wave shaping circuits.

PIN DIAGRAM:

133

CIRCUIT DIAGRAM OF INTEGRATOR:

DESIGN:

We know the frequency at which the gain is 0 dB, fb = 1 / (2π R1 Cf) Therefore fb = _____Since fb = 10 fa, and also the gain limiting frequency fa = 1 / (2π Rf Cf) We get, Rf = _______ and hence R1 = __________

PROCEDURE:

1. Connections are given as per the circuit diagram.2. + Vcc and - Vcc supply is given to the power supply terminal of the Op-Amp IC.3. By adjusting the amplitude and frequency knobs of the function generator, appropriate

input voltage is applied to the inverting input terminal of the Op-Amp.

134

Am

plit

ude

Am

plit

ude

4. The output voltage is obtained in the CRO and the input and output voltage waveforms are plotted in a graph sheet.

OBSERVATIONS:

S.No. Amplitude( No. of div x Volts per div )

Time period( No. of div x Time per div )

InputOutput

MODEL GRAPH:

INTEGRATOR:

INPUT SIGNAL:

Time PeriodOUTPUT SIGNAL:

RESULT:

The design of the Integrator circuit was done and the input and output waveforms were obtained.

135

EX.NO. 24 TIMER IC APPLICATIONS - I(ASTABLE MULTIVIBRATOR)

AIM:

To design an astable multivibrator circuit for the given specifications using 555 TimerIC.

APPARATUS REQUIRED:

S. No Name of the Apparatus Range Quantity1. Function Generator 3 MHz 12. CRO 30 MHz 13. Dual RPS 0 - 30 V 14. Timer IC IC 555 15. Bread Board 16. Resistors7. Capacitors8. Connecting wires and probes As required

THEORY:An astable multivibrator, often called a free-running multivibrator, is a rectangular-

wave-generating circuit. This circuit do not require an external trigger to change the state of the output. The time during which the output is either high or low is determined by two resistors and a capacitor, which are connected externally to the 555 timer. The time during which the capacitor charges from 1/3 Vcc to 2/3 Vcc is equal to the time the output is high and is given by,

tc = 0.69 (R1 + R2) C

Similarly the time during which the capacitor discharges from 2/3 Vcc to 1/3 Vcc is equal to the time the output is low and is given by,

td = 0.69 (R2) C

Thus the total time period of the output waveform is,

T = tc + td = 0.69 (R1 + 2 R2) C

The term duty cycle is often used in conjunction with the astable multivibrator. The duty cycle is the ratio of the time tc during which the output is high to the total time period T. It is generally expressed in percentage. In equation form,

% duty cycle = [(R1 + R2) / (R1 + 2 R2)] x 100

136

PIN DIAGRAM:

CIRCUIT DIAGRAM OF ASTABLE MULTIVIBRATOR:

137

DESIGN:

Given f= 4 KHz,Therefore, Total time period, T = 1/f = ____________

We know, duty cycle = tc / TTherefore, tc=------------------------

and td = ____________

We also know for an astable multivibrator td = 0.69 (R2) CTherefore, R2 = _____________

tc = 0.69 (R1 + R2) CTherefore, R1 = _____________

PROCEDURE:

1. Connections are given as per the circuit diagram.2. + 5V supply is given to the + Vcc terminal of the timer IC.3. At pin 3 the output waveform is observed with the help of a CRO4. At pin 6 the capacitor voltage is obtained in the CRO and the V 0 and Vc voltage

waveforms are plotted in a graph sheet.

OBSERVATIONS:

S.No Waveforms

Amplitude( No. of div xVolts per div )

Time period( No. of div xTime per div )

tc td

1. Output Voltage , Vo

2. Capacitor voltage , Vc

138

O/p

volt

age

Cap

acit

orvo

ltag

eMODEL GRAPH:

Vcc

T (ms)

2/3 Vcc

1/3 Vcc

TON TOFF

RESULT:

The design of the Astable multivibrator circuit was done and the output voltage and capacitor voltage waveforms were obtained.

139

TIMER IC APPLICATIONS -II (MONOSTABLE MULTIVIBRATOR)

AIM:

To design a monostable multivibrator for the given specifications using 555 Timer IC.

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity1. Function Generator 3 MHz, Analog 12. CRO 30 MHz 13. Dual RPS 0 - 30 V 14. Timer IC IC 555 15. Bread Board 16. Resistors7. Capacitors8. Connecting wires and probes As required

THEORY:A monostable multivibrator often called a one-shot multivibrator is a pulse generating

circuit in which the duration of the pulse is determined by the RC network connected externally to the 555 timer. In a stable or stand-by state the output of the circuit is approximately zero or at logic low level. When an external trigger pulse is applied, the output is forced to go high (approx. Vcc). The time during which the output remains high is given by,

tp = 1.1 R1 CAt the end of the timing interval, the output automatically reverts back to its logic low

state. The output stays low until a trigger pulse is applied again. Then the cycle repeats. Thus the monostable state has only one stable state hence the name monostable.

PIN DIAGRAM:

140

CIRCUIT DIAGRAM OF MONOSTABLE MULTIVIBRATOR:

DESIGN:

Given tp = 0.616 ms = 1.1 R1 C Therefore, R1 = _____________

PROCEDURE:

1. Connections are given as per the circuit diagram.2. + 5V supply is given to the + Vcc terminal of the timer IC.3. A negative trigger pulse of 5V, 2 KHz is applied to pin 2 of the 555 IC4. At pin 3 the output waveform is observed with the help of a CRO5. At pin 6 the capacitor voltage is obtained in the CRO and the V 0 and Vc voltage

waveforms are plotted in a graph sheet.

OBSERVATIONS:

S.No

Amplitude( No. of div xVolts per div )

Time period( No. of div xTime per div )

ton toff

1. Trigger input

2. Output Voltage , Vo

3. Capacitor voltage , Vc

141

MODEL GRAPH:

RESULT:

The design of the Monostable multivibrator circuit was done and the input and output waveforms were obtained.

142

student observation

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