EE008-3.5-3-MSES Lab Brief

SCHOOL OF ENGINEERING-APU Prepared by: Veeraiyah Thangasamy Page 1

Lab 1. SIMPLE INTERFACING LCD INTERFACE AND DIGIATL CLOCK

Task to do:

Develop an assembly language program for the 8085 Microprocessor for displaying

DIGITAL CLOCK in hh:mm:ss format using LCD interface and 8255 PPI. Demonstrate

the same in the laboratory.

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BACKGROUND THEORY:

A 8255 is a general purpose Programmable Peripheral Interface (PPI) provided on the

board of MP85 to enable the user to interface any real world application to the

microprocessor. It has three 8-bit parallel ports that can be configured individually as

input or as output depending on the requirement. The chip has been used in I/O mapped

mode and has an address of (A0-A7). LCD displays has alphanumeric characters

arranged as 16x2, 32x2, 16x4, 32x4 etc. as shown below:

(Source: http://fdalcd.net)

DELIVERABLES:

During submission you are expected to have the following:

Interface diagram

Source code

Observation & Results

A comprehensive report covering the requirements as listed above with discussion and

conclusion.