I have a question about programming a PIC18F87J50.

I wonder how I should write a interrupt routine that works as a timer.
I need a stable timer that gives a interrupt every 0,25 us (4 MHz pulses). and the PIC CPU is working on 48MHz. Is it even possible to write such a routine?


  • All micros have a certain kind of overhead when calling an interrupt, and that interrupt will lag up the whole CPU.

    Why don't you use a hardware PWM instead and save you the trouble?
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