The code below was written deliberately without using include files, labels
definitions etc, To absolutely ensure that no oddities were going on also it
does not require anybody else who tries the code to have the same header
files or include files. (In case they are not using MPLAB, And some do not!)
The program is also small and simple. The problem is not a code/software
problem. But appears to be a hardware problem with the PIC and RB3.

I started with a working program that was using include files, macro etc. A
program that has been in use in over 200 finished units that have been
working happily for up to 3 years (so far). This same code in the same
circuit using an A revision chip fails to function correctly. I ended up the
simple code to prove it was not me but the PIC. (I was convinced it was me
and did everything I could to prove it was not before settling for the PIC
as the cause.)

Regards

Clive Frederickson
R&D Technician (CECF Group)

        ----------
        From:  Olin Lathrop [SMTP:olin_piclist@EMBEDINC.COM]
        Sent:  01 May 2001 12:25
        Subject:  Re: [PIC]: P16F84 'A' Fun and Frolics

        >         BCF     3,5             ; Bank 0
        >
        >         CLRF    05              ; Clear PORT A
        >         CLRF    06              ; Clear PORT B
        >         CLRF    0B              ; Clear INTCON register 0000,0000

        Use the include file and mnemonic register names!  Looking for bugs
in this
        code is a complete waste of time until you follow reasonable coding
        practices.  Then you also don't have to waste the comments on
explaining
        the instruction, but spend them instead on explaining the purpose of
the
        instruction.


        ********************************************************************
        Olin Lathrop, embedded systems consultant in Littleton Massachusetts
        (978) 742-9014, olin@embedinc.com, http://www.embedinc.com


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