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Edge/Pulse counter in F28M35

Gabriel Brunheira
Intellectual 440 points


Hi!

I would like to know how to implement an edge counter using any of the peripherals from F28M35 (either from M3 core, or C28 core).

My pulse signal has a frequency between 10 Mhz and 20 MHz, and it must be a 17 bits counter, with a prescaler of 8:1 ratio (or a 20 bits counter, with no prescaler). 

I've seen the Input Edge-Count Mode from the M3 General Purpose Timers, but I don't want to set the TnEN by software, each time the current count matches the value in the GPTMnMATCHR register.

Any ideas?


Thanks in advance,


Gabriel