I understand completely. Good luck and let me know if you get back to it. By the way, assuming you are using an 11.059 MHz oscillator, and assuming 12 clock cycles per machine cycle, then the timer register will increment in steps of 1.085 µs. Thus, a reload value of 10 will give you a 10.85 µs interval, or a reload value of 9 would give you a 9.77 µs interval. Of course, there is still setup, entry and exit overhead to calculate, but you aren't trying to do anything that should be impossible.

Later,