7 segment report

8/10/2019 7 Segment Report

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SHAHJALAL UNIVERSITY OF SCIENCE AND TECHNOLOGY

DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING

Course Title: Computer interfacing and industrial automation Lab

Course Code: EEE-424

Experiment No.:

Experiment Name: Write a program to display the digits in decimal, from 0-9 into 7-

segment using the module.

Date of Submission: November 30, 2014

Submitted to:

Md. Rasedujjaman

Assistant Professor,

Department of Electrical and Electronic Engineering,

Shahjalal University of Science and Technology.

Submitted by: Group-

Jibesh Kanti Saha

Reg. No.: 2010338014

4th Year 1stSemester

Department of Eletrical and Eletronic Engineering,

Shahjalal University of Science and Technology.
http://www.sust.edu/department/eee/index.php/en/faculty/91-md-rasedujjaman?TB_iframe=true&height=600&width=1000http://www.sust.edu/department/eee/index.php/en/faculty/91-md-rasedujjaman?TB_iframe=true&height=600&width=1000


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Objective:

The main objective of this experiment is to write a program in the software

provided for the module MDA-Win8086 and display digits 1-9 in the 7-

segment of the module. Understanding the interface between the 7-segment and 8086 and how they

works.

Theory:

Interfacing:

The 7 segment inside the MDA8086 trainer kit can be used to display

numbers.

This requires PIO 8255 ports which are already connected to the 7 segment

internally.

Through the code we can access these ports and provide binary or hex

value to switch the required segment on and off.

In order to turn a segment ON, a logical 0 is required as shown below. So

the 7 segment is Common Anode (CA).

Any number from 0 9 can be display on the 7 segment by providing theactual hex or binary value which turns those segments ON to display the

digit.


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dp g f e d c b a Decimal hex

1 1 0 0 0 0 0 0 0 C0

1 1 1 1 1 0 0 1 1 F9

1 0 1 0 0 1 0 0 2 A4

1 0 1 1 0 0 0 0 3 B0

1 0 0 1 1 0 0 1 4 99

1 0 0 1 0 0 1 0 5 92

1 0 0 0 0 0 1 0 6 82

1 1 1 1 1 0 0 0 7 F8

1 0 0 0 0 0 0 0 8 80

1 0 0 1 0 0 0 0 9 90

The interfacing circuit of the 7-segment and the 8086 via the PPI 8255A:


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Process:

Connected the kit with the PC and set the kit in PC mode. Opened the MDA-WinIDE8086program.

Wrote the code on the editor window.

Complied and ran the code.

Output was shown in the 7-segment of of the module.

In this experiment we operated the 8255 in Mode-0 where all 3 ports (Port-A, port-B and port-C) are set as output port by inputting proper control

word in the control register.In mode-0 the imput data at once is shown in the output. So when the code is

executed, the data is accordingly transferred to output (7-segment display) inparallel lines.


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Discussion:

The communication between 8086 and 7-segment is done by simple I/Omethod via the peripheral interface device 8255A. In this method the 8086

sends data assuming 7-segment is always ready to receive the byte. This isthe simplest form of data transfer between a microprocessor and a peripheral

device.

7 segment report

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