----- Original Message -----
From: Dipperstein, Michael <mdippers@HARRIS.COM>


> If ADCON sets RA1 to be an analog input, then it doesn't matter what TRISA
is
> set to, RA1 will be an analog input.

Sorry, I believe that the appropriate TRISA bit has to be set as an input, I
have actually run across a situation where the digital circuitry of the pin
forced the pin high or low, and made the midrance highly non-linear on
analog readin.

"The analog input channels must have their corresponding TRIS bits selected
as inputs."
 PIC16F872 data sheet, p87

Maybe some chips aren't like this but there is actually a case for it.  Read
the appropriate data sheet for the chip in question.  I've found that it's
very easy to overlook critical information in Microchip's data sheets.

Jeff
demaagd.com

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