Any way to generate an edge with zero latency on trigger?

[Zer0flag]

Hi all!

As far as I can see there is no way to generate a zero-latency rising or falling edge on a PIC's output pin when an external trigger edge arrives on another pin. Or am I wrong? If there is such a possibility e.g. on a dsPIC please let me know.
I am looking for something like the "zero-latency edge generation" from the CCP module when this is set to compare mode and the corresponding timer reaches a preset value.
If there is no such thing I will have to use an interrupt like int_ext but this means there will be some interrupt latency which can take some time on a PIC18. To measure this interrupt latency exactly I would trigger the CCP module in capture mode and catch the exact position of the timer when the trigger edge arrives. Then when I get into the CCP ISR I will compare the current timer value with the catched timer value. This way I can tell exactly how much time has passed since the external trigger edge arrived. Is this correct?

Best regards and thank you for any help,
Zer0flag

[SherpaDoug]

How about having a PIC pin run to an external AND gate that passes the input to the output when conditions merit?
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[Zer0flag]

Thank you. Actually I was thinking of something like that. I wanted to make sure that there is no PIC-internal way to do it.

[kolio]

What about using built-in comparator and its output?

[Zer0flag]