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How can I use 8051 I/O pins to emulate PWM output signal?

Jian Jian

Hi Everyone:
I am from China.I have a question
that is need your help.That is I wanted
to use some 8051 pins to emulate PWM
output signals,please tell me source program about KEIL C for 8051.Thank you!

yours truly
JianJian

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  • 0

    Hi Jian Jian!

    Well, many C51 derivates have PWM on chip. Other than that, yopu can do that with a timer interrupt. Trigger the interrupt of the timer like every mili second and then count the HIGH and LOW times of your signal with a counter... teh resolution will not be really great, but for some purposes it works... you can sure set the resolution to less than a milli second of course, but when it is too short, you will spend all processor time for the PWM signals.

    Take care,
    Sven

Reply
  • 0

    Hi Jian Jian!

    Well, many C51 derivates have PWM on chip. Other than that, yopu can do that with a timer interrupt. Trigger the interrupt of the timer like every mili second and then count the HIGH and LOW times of your signal with a counter... teh resolution will not be really great, but for some purposes it works... you can sure set the resolution to less than a milli second of course, but when it is too short, you will spend all processor time for the PWM signals.

    Take care,
    Sven

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