I've found that that varies from pin to pin and chip to chip.  A schmidt (sp?)
trigger has specified points, and is really the only reliable way to go.

PICs are CMOS devices, and if you are just looking for a general idea, look at
CMOS specs.

-Adam

Jim Dolson wrote:
>
> I've checked the datasheet for the 16f8xx but can't find the answer to a
> question.
>
> Assume that we are running the PIC at 5V.
>
> If we put 0 V on a pin configured for input, it will read as 0.
> If we put 5 V on a pin configured for input, it will read as 1.
>
> (1) If you slowly increase the voltage on the pin, at what voltage will
> the pin read as a "1" ?
>
> (2) Does the answer change if it is one of the pins that has a Schmitt
> Trigger built in?
>
> Thanks,
>
> Jim