I'm trying to program a Timer Interrupt that will go off every 33 ms. I am doing this on the ATtiny85 which has a 20MHz clock. The maximum prescaler I can set is 32 so the longest possible time a single interrupt can be is 408 microseconds.
My plan to reach 33 milliseconds is to just run the interrupt 81 times and that will get me the desired 33 milliseconds. However, I have no clue as to how you can actually count how many time an interrupt has taken place. Anyone on here know how to do that or have any idea as to what would work?