> What happens if one puts -0.75V on a PIC's I/O pin, with
> limited current (say max 10 mA)?

This is within the 'absolute maxima', so you chip will not die.

But it is outside the 'normal operating conditions', so the chip is not
guaranteed to behave conform the datasheet.

If you feel like taking a chance you could try and see. But such a test
has limited scope: one temperature, one Vcc, one chip, one program, etc.

One thing that has been reported: even a very small current through the
protection diodes can seriously affect the A/D accuracy.

NB this has been discussed over and over, but there are two vieuwpoints:
1- propper operation is not guaranteed so don't do it
2- it will probably work so why not (but IIRC 10mA is a pretty high
current, even for the proponents of this viewpoint)

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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