General microprocessors

Here is the program for Pulse width modulation PWM on basic for 89s52.

You could generate pwm using the following psedocode

#define high_period

#define low_period

main()

{

!!Code to initiate the timer;

!!Timer counter register value = high_period;

!!set port pin high

!!start timer

while(1);

}

interrupt void time_interrupt_routine(void)

{

if(port pin is high)

!!Timer counter register value = low_period;

else

!!Timer counter register value = high_period;

!!Toggle port pin

!! start timer;

}

Here high_period + low_period gives the time period in terms of clock cycle and

high_period/(high_period + low_period) *100 gives the dutycycle.

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