The Practice of Micro-processor

Yonam Institute of Digital Technology

04. FND (7-Segment) Control

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7-Segment LED usually used to display represented information LED can not easily display variant information 7-Segment device designed to solve the problem Using in our life:

Elevator’s floor indicator, Digital Clocks, Electric board, …

External Form & Structure

Overview of 7-SegmentOverview of 7-Segment

a

b

cd

gf

e

p

Anode Common 7-Segment A device which organized 8 LED each LED has VCC(Logic ‘H’) status for Off

and GND(Logic ‘L’) status for On

Overview of 7-SegmentOverview of 7-Segment

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Hexadecimal output in 7-Hexadecimal output in 7-Gegment(Anode)Gegment(Anode)

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Display HEX dot(p) g f e d c b a

0 0xc0 1 1 0 0 0 0 0 0

1 0xf9 1 1 1 1 1 0 0 1

2 0xa4 1 0 1 0 0 1 0 0

3 0xb0 1 0 1 1 0 0 0 0

4 0x99 1 0 0 1 1 0 0 1

5 0x92 1 0 0 1 0 0 1 0

6 0x82 1 0 0 0 0 0 1 0

7 0xd8 1 1 1 1 1 0 0 0

8 0x80 1 0 0 0 0 0 0 0

9 0x98 1 0 0 1 0 0 0 0

a 0x99 1 0 0 0 1 0 0 0

b 0x83 1 0 0 0 0 0 1 1

c 0xc6 1 1 0 0 0 1 1 0

d 0xa1 1 0 1 0 0 0 0 1

e 0x86 1 0 0 0 0 1 1 0

f 0x8e 1 0 0 0 1 1 1 0

. 0x7f 0 1 1 1 1 1 1 1

Test-Board contains four 7-Segments

7-Segments in Test Board7-Segments in Test Board

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Port Specify

PA transmit data to 7-Segment using its data line which connected parallely (Output)

PB.0~3 control 7-Segments through connected 2SA1015 Transistors

Arrangement of 7-Segment Components

7-Segment Display

Data Bus, Chip Select Jumper

Chip Select Q3 Q2 Q1 Q06

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Wiring Diagram

  

AVR8535MCU Module

Multi DigitalBreadboard

PA.0 ●

PA.1 ●

PA.2 ●

PA.3 ●

PA.4 ●

PA.5 ●

PA.6 ●

PA.7 ●

● Q.0

● Q.1

● Q.2

● Q.3

● A

● B

● C

● D

● E

● F

● G

● P

PB.0 ●

PB.1 ●

PB.2 ●

PB.3 ●

PB.4 ●

PB.5 ●

PB.6 ●

PB.7 ●

8583PA PORT

8583PB PORT

7-SegmentPart

7-SegmentPart

Practice of 7-Segment ControlPractice of 7-Segment Control

4 개의  7-Segment에 ‘ 1111’을 디스플레이하게 하라 .

insert ‘0xf9’ into ‘PORTA’ permit ‘0’ or ‘1’ to ‘PORTB’

0 means that it select corresponding chip(FND) ex) PORTB.0=0; or PORTB.0=1;

b

c

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4 개의  7-Segment에 ‘ a~p’를 반복하여 순회하게 하라 .

…

Order p g f e d c b a

1(0xff) 1 1 1 1 1 1 1 1

2(0xfe)

1 1 1 1 1 1 1 0

3(0xfd)

1 1 1 1 1 1 0 1

4(0xfb)

1 1 1 1 1 0 1 1

5(0xf7)

1 1 1 1 0 1 1 1

6(0xef)

1 1 1 0 1 1 1 1

7(0xdf)

1 1 0 1 1 1 1 1

8(0xbf)

1 0 1 1 1 1 1 1

9(0x7f)

0 1 1 1 1 1 1 1

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4 개의  7-Segment에 숫자 ‘ 0~9’를 오름차순으로 디스플레이 하라 .

4 개의  7-Segment에 숫자 ‘ 0~9’를 내림차순으로 디스플레이 하라 .

…

…

Advanced PracticeAdvanced Practice

7-Segment에 ‘ 0000’ → ‘9999’ 업 카운터하며 디스플레이 하라 .

7-Segment에 ‘ 9999’ → ‘0000’ 다운 카운터하며 디스플레이 하라 .

Digital Input의  Switch를  On시킨 횟수를 카운터하여  7-Segment에 디스플레이 하라 .

다음과 같이  Digital Input의 위치를 가정하여  Switch의 동작을 7-Segment에 반영하여 디스플레이 하라 .

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