Trapping a flag/state change (rapidly)

[cncmachineguy]

Henrik, I LOVE THAT!!!!!

Hank, I think I like Henrik's idea better, but may or may not work for your app. Are any of the current 2 timers you have ISR's or are they just being used? Cuz if either of them have ISR, you can use that for the timebase. Increment counters there and check for button.

[HenrikOlsson]

If you use TMR2 as the PWM timebase you can use its postscaler as "divider" between the PWM frequency and interrupt frequency. If you have, say, 16kHz PWM frequency and set the postscaler to 1:16 you'll get an interrupt rate of 1kHz which you can use as a timebase if nothing else you already have running is suitable for that.

Again, there are many ways.....

/Henrik.