On Tue, 20 Aug 2002 12:40:20 -0400 James.Hyslop@BMWMC.COM writes:
> Anything for the 18C452 will work on the 18F452, just change any
> references
> of "C" to "F"...there is 18C452 code on PIClist.com and also
> microchip.com.
>

        The configuration bits are different between the C and the F. And, I
have one product that I've not been able to move from the C to the F. It
started on the 16c74, moved to the 18c452, but doesn't work on the
18f452. Several other products have moved over fine. The only thing I can
think of on this one product is that I'm doing an AC line zero cross
detect on the RB0/INT pin. I full wave rectify the transformer secondary,
then apply it to RB0 through a current limit resistor, letting the clamp
diodes limit the positive peak. There MAY be a difference in the way the
clamp diodes work on the F, or there might be a problem with this voltage
appearing before the main 5V supply has appeared (since it takes time to
charge the filter capacitor), or may be something else. For now, we've
kept this product on the 18c452. Everything else has moved to the F.

Harold


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