Good day/morning/night gentlemans.

I have a question which may be defined as FAQ.
I have to synchronize a zero cross main signals with an output nibble on
both rising and falling edge.
I have done this in hardware using one 4093 and a few resistors,
capacitors and one zenner for detection and a 74ls373 for command.
I'm not sure if the best choice on a PIC will be to use rb0 as zero
cross detection interrupt. The nibble must be outputed
synchronously with the rising edge of the mains signal and shutted off
after a desired time period on the falling edge of the same signal.
I think also interrupt on change could satisfy this request but I want to
know other opinions.
The PIC will be 16F628.

Thank you in advance and have a happy day.

Vasile

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