INTERFACE A 7-SEGMENT DISPLAY PAIR WITH PORT 0

INTERFACE A 7-SEGMENT DISPLAY PAIR WITH PORT 0

In this project we will show how to interface 7_segment display with port 0 of microcontroller.

Steps:

First of all make your microcontroller active by connecting the crystal from pin number 18 and 19(see in figure 2) 
Set the reset button from pin 9 as shown in figure 3.
Make the controller in working order as show in figure 4, then connect an LED through resistor to pin of port 1.0

Write a program of interface 7_segment display with port 0 of microcontroller in assembly language.

Burn the assembly language program in microcontroller through universal programmer.

You can see th wave form on oscilloscope.

Circuit Diagram:

pic configuration of ATML 89S52

Attachment of crystall figure number 2

Reset button figure no.3

Working condition of microcontroller figure 4

connection of 7-segment display

If we want to connect more than one 7 segment

7 Segment Display

Assembly Language Program :

 

ORG 00H

MAIN:

MOV P2,#10H

MOV P0,#3FH

CALL DELAY

MOV P0,#3FH

CALL DELAY

MOV P0,#06H

CALL DELAY

MOV P0,#5BH

CALL DELAY

MOV P0,#4FH

CALL DELAY

MOV P0,#66H

CALL DELAY

MOV P0,#6DH

CALL DELAY

MOV P0,#7DH

CALL DELAY

MOV P0,#07H

CALL DELAY

MOV P0,#6FH

CALL DELAY

MOV P0,#77H

CALL DELAY

MOV P0,#7CH

CALL DELAY

MOV P0,#39H

CALL DELAY

MOV P0,#5EH

CALL DELAY

MOV P0,#79H

CALL DELAY

MOV P0,#71H

CALL DELAY

MOV P2,#20H ; NEXT 7-SEGMENT PAIR ON AND FIRST CLOSE

MOV P0,#3FH

CALL DELAY

MOV P0,#3FH

CALL DELAY

MOV P0,#06H

CALL DELAY

MOV P0,#5BH

CALL DELAY

MOV P0,#4FH

CALL DELAY

MOV P0,#66H

CALL DELAY

MOV P0,#6DH

CALL DELAY

MOV P0,#7DH

CALL DELAY

MOV P0,#07H

CALL DELAY

MOV P0,#6FH

CALL DELAY

MOV P0,#77H

CALL DELAY

MOV P0,#7CH

CALL DELAY

MOV P0,#39H

CALL DELAY

MOV P0,#5EH

CALL DELAY

MOV P0,#79H

CALL DELAY

MOV P0,#71H

CALL DELAY

JMP MAIN

DELAY:MOV R3,#10  ; DELAY IN DISPLAY OF 1 SECOND

LOOP0:MOV R2,#100

LOOP1:MOV R1,#2

LOOP2:MOV R2,#230

LOOP3:DJNZ R0,LOOP3

DJNZ R1,LOOP2

DJNZ R2,LOOP1

DJNZ R3,LOOP0

RET

  Note: This is a program of 2 & segment display, so we can write 3 r 4 display too.

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