Wouter van Ooijen wrote:
> But IIRC that is only true for the 12/14 bits, not for the 18F (16
> bit)?

It is true for all PICs I have looked at, which include several 18F.  I'm
looking at the 18F6520 data sheet right now, and the ADCON1 register is
shown with initial value of 0 (page 214, DS39609A) which means maximum
number of analog inputs.

The reason is so that each pin wakes up in the most benign state from the
external circuit point of view.  Both analog and digital inputs would be
high impedence, but digital inputs can cause larger currents and undesirable
behaviour internally when held at intermediate voltages for long periods of
time.  Therefore waking up a pin as analog when there is a choice is safer.
It's no big deal since the code can easily configure it any way it wants to
once it starts running.


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