Yes, I think that is the perfect solution. Sergio's code is good but the
same number of instructions.

Using Wouter's idea of the comparator I can use the same code I always
used, but save an external inverter by using the internal comparator.

Thanks to everyone!

Best regards,

Bob

On Sun, Jan 15, 2012, at 12:03 PM, Kerry Wentworth wrote:
> I don't see the downside of Wouter's suggestion of using a voltage=20
> comparator.
> Output the bit on A0, which is connected to A1.
> Set comparator1 to compare the voltage on A1 to 2.5V from the voltage=20
> reference.
> Output comparator 1 results to A3.
> A3 will always the the inversion of A0.
> Why wouldn't that do what you want?
>=20
> Kerry
>=20
>=20
>=20
> Bob Blick wrote:
> > I have an existing small PIC project that produces an output on one pin
> > based on the high bit of a register. In order to save an external
> > inverter, I'd like to also output the complement on another pin. For th=
e
> > sake of argument let's say it is an oscillator that blinks an LED or
> > drives a transducer.
> >
> > The target is a 16F627A and any pins are fair game, but glitches are no=
t
> > OK to the two pins, so no math or rotates directly on the ports.
> >
> > It is OK to do anything to any of the other pins.
> >
> > It is OK for there to be a little latency, and either port A or port B
> > is OK. Or even both ports, though I don't see how that could get any
> > faster.
> >
> > Here's the fastest thing I could come up with:
> >
> >  movlw 0x55
> >  btfss bigreg,7
> >  movlw 0xAA
> >  movwf PORTA
> >
> > This is almost fast enough, if I could shave an instruction off one of
> > the two conditions it would be enough for me.
> >
> > Any suggestions?
> >
> > Thanks, Bob

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