Are you perhaps confusing the F677 (in the subject line) with the F877?
Cheers,
-Neil.




Jinx wrote:
> 
>> the ANSEL register...thats what I was missing from it and
>> what I expected to find for the selection
> 
> Ah. I believe the F877 was the first with ADC (14000 not
> withstanding), so I regard it as the baseline ADC micro.
> Subsequent ADC micros, such as the F88, are different
> from the F877 (in that they have more functions and need
> the ANSEL register), not the other way around. But of
> course that all depends on your POV. Different is different.
> I used the F877 a long time before the F88 so look at it
> chronologically. If you'd used the F88 before the F877,
> then you would find things missing (eventually ;-) )
> 
> Incidentally, the various analogue products I made with the
> F877 taught me, the hard way, that analogue inputs can be
> fragile. Two of the products involved relays and solenoids,
> and analogue pins were totally munted by ground spikes. These
> were down to over -1V and caused the internal diodes to
> conduct, frying the pin circuitry. The rest of the chip is fine,
> but leaves it really only useful as a stunt PIC. The minimal
> solution is to pay attention to ground layout and wire choice/
> routing, have current-limiting series resistors and Schottky
> diodes to both Vcc and Vss
> 
> 
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