On Thu, 27 Jun 2002 22:22:42 -0400, Brandon Stewart wrote:

>What is the purpose of having this Vref?  Why not use the=
 internal
>5V reference all the time?  If it is for accuracy reasons, then=
 if
>your 5v line goes wacky... then can you count on the PIC during=
 that
>time anyway?

Quite a few sensors have analog signals in the 0-2.5 volt range.=
 By
using a different VREF you get finer readings.

Tim

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