TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

In this practical we use timer 0 to create a square wave on P1.0 by connecting an LED through resistor also show the waveform on Oscilloscope.

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 ON and OFF LED by using timer 0/1 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

LED connection

Assembly Language Program :

ORG 00H

MOV P1,#0FFH

MAIN:MOV TMOD,#01H

MOV TH0,#00H

MOV TL0,#00H

SETB TR0

LOOP: JNB TF0,LOOP

CPL P1.0

CLR TR0

CLR TF0

JMP MAIN

For any question comment below or click here for further information