>going into AN0 of a 16F877. It works but the
>signal must have some negative-going components
>(or possibly a switch glitch) as the port
>occassionally latches. How can I best protect
>the pin against signals going below Vss-0.6V

I would put a schotkky diode across the zener diode - check RS for a BAT64
or similar diode.

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