On 6/5/06, Bob Axtell <engineer@cotse.net> wrote:
> Charles Oram wrote:
> > Hi,
> > Has anyone out there had problems migrating form the PIC16F877 to the
> > PIC16F877A, particularly in the areas of the oscillator and MCLR pin? I've
> > noticed from the datasheets, migration document and searching on the 'net
> > that these could be problem areas. The circuit I have pulls MCLR up with a
> > 100k resistor (most seem to use a 10k).
> >
> 100K is far outside the value expected by the ICD2 and most programmers.
> 27K is the highest value I  would recommend. 10K is what Microchip
> recommends, but I think it is too low.

Other than this problem, there is a migration document which may be
of some help.
http://ww1.microchip.com/downloads/en/DeviceDoc/39591a.pdf

Regards,
Xiaofan
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