Mark Beetge [ MTN - Harrington Street ] wrote:
> The problem only occurs when I set the
> A2D to use its internal Vref. If I set it to use an external Vref and
> supply 5V and Gnd to the respective pins, I get the correct result.

Are all the other PIC pins between 0 and 5V?  I've seen strange things
happen to A/D readings when even a little current goes thru a protection
diode, particularly if it's another analog input.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body