PWM

[masiha308]

Hi there

I want to set a pwm module in PIC16F877A but i dont know how to set this.
Can you help me?
I you can tell me step-by-step to design a pwm pulse for a variable duty cycle and variable priod.

thank you

[Ttelmah]

ex_pwm.c with the compiler.

Varying the actual frequency, is very rare in PWM applications. Problem is that as you change the frequency, the 'legal' values for duty change with them. Normally a PWM application, would run fixed frequency, and just vary the duty cycle, or if you wamted a variable frequency 'source', then you would run at either a fixed pulse width, or at just 50% duty cycle. Varying both in the same code would get complex....

Best Wishes

[PCM programmer]

There are a large number of PWM sample programs in the forum
archives. You can use the forum's Search engine to find them.
Take a pwm function from the CCS manual. Put the name of the
function and your PIC type into the search engine. Example: