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[MegaADY]

Thanks for your advice. I theory I know how to make it work.
Thae problem is that after reading a lot of threads related to this topic, It's a big messup in my head related to TMR0.
I know that this kind of question are not agreed around here, but... I would really need a working program which can count a few hundred cycles. I am testing it with 16f628a@20MHz
Thanks in advance.

[Acetronics2]

Hi, Mega

TMR1 of the 16F628 has a feature called "CAPTURE" ... have a look to Microchip DATAs, and you'll see how it flags an interrupt for as much as you want counts ...

Darrel's instant interrupts also look great here ...

As a joke ... if ONLY 3.5 Mhz input must be counted ( hé, hé ... ) a NE567 PLL could make a good enabling gate command.

Alain