At 09:49 AM 3/9/00 -0500, you 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" ?

In the 16F87x spec, section 15.3 gives the DC characteristics of all the pins.
The TTL I/O pins @ 5v VDD at 2v min to VDD max.

>
>(2) Does the answer change if it is one of the pins that has a Schmitt
>Trigger built in?
>

Yes.  The Schmitt trigger pins at .8VDD min to VDD max.

>Thanks,
>
>Jim
>