At 11:44 25/06/2002 +0000, Drew Vassallo wrote:
>>The result is that the error has been reduced as I'm now
>>reading $002 instead of $004 or $008 in the 'unused' channels.
>
>I've never seen a "noise problem" when using the A/D.  Every time I pull the
>pin to ground (turn the pot to zero) it reads 0x000.  Not 0x002 or 0x001,
>but 0x000.

I also have one MPLAB-ICD demo board with a 16F877 that has
a potentiometer connected to one of the analog inputs, and there
I also do read a zero if I pull the pin to ground via the pot.

However this device runs on a much slower clock (about 2 MHz)
so an hypothetical noise problem would be less evident there.

>There must be something else causing it not to drop all the way.  But at
>320us, it sounds like you're giving it plenty of time.  Have you tried 500us
>just to see?  How about 1ms?

I tried, but doesn't help..

Thx,
G.


>--Andrew
>
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