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.
> I don't know if I will have a problem and I know that the real answer is 
> "try
> it and see", but I have a customer who needs to build 80 units and can't get
> '877s, so they want to build them with the '877A and have me fix the
> software to work later.
>   
That resistor is probably your main problem.

> regards,
> Charles
>
> _________________________________________________________________
> Check out the latest video  @  http://xtra.co.nz/streaming
>
>   

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist