> What happens if a PIC pin configured as a 10bit a\d receives negative 
> voltage... 

then you are operating the PIC outside its specifications. anything
might happen, including cold fusion.

> I'm interfacing an lm35c temperature sensor to a 
> pic and it says 
> on the datasheet that lm35 will produce a negative output 
> voltage when 
> measuring less than 0 degrees celsius...

it won't 'produce' a negative output. the trick is to have the gnd of
the lm35 1..2 volt above the PIC ground. read the lm35 datasheet, it is
explained there.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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