Experiment No. 2

Aim: Write a program to generate square wave of 50% duty cycle having frequency 5 KHz at port pin P2.1 using timer 1 in mode 2. Modify program to generate pulse waveform of 70% duty cycle using timer on the same pin.Circuit Diagram

Fig.1 Circuit diagram for generating the 50% duty cycle pulse having 5 kHz frequency on P2.1 pinWorksheet 2

1) Modify program for 80% duty cycle

Hint: Use separate delay loop for ON time and OFF time. Total time is 200 s, so use 160 s for ON time and 40 s for OFF time. You can also prepare delay subroutine of 10 s. Call delay subroutine 16 times for ON time and 4 times for OFF time.2) Execute following C program in Keil and measure frequency of the square

wave.

# include

#include

sbit wave_pin P1^0;

void sqdelay(unsigned int);

void main(void)

{

while(1)

{

wave_pin=1;

sqdelay(100);

wave_pin=0;

sqdelay(100);

}

}

void sqdelay(unsigned int t)

{

unsigned int i,j;

for(i=0;i