> As far as feeding the comparator <300mV (even though
> the data sheet seems to say that's fine), the comparator's
> output is quite simply wrong.  :-O  300mV to the + input
> and 0V to the - input does *not* result in a high comparator
> output, even though the + input is at a higher voltage than
> the - input

I've had no trouble at all using the comparators at low voltages,
for example C2 as a motor status indicator. A2 is set to 60mV
by a 100R : 8k2 division of 5V and A1 gets either 0V (motor off)
or  110mV (motor on) back from the motor sense resistor and the
value of cmcon,c2out is used to enable/disable the motor drive
circuitry. The set-up for C2

         bank0
         movlw   b'00000101'  ;enable Comparator2
         movwf   cmcon

and

         btfsc   cmcon,c2out  ;test comparator

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