Hi all,

Wonder if anyone can help.

I designed a product using the PIC 16F84... we use a surface mount part and
program it on the board. I had to introduce a jumper to allow me to isolate
MCLR from the POR circuitry during programming and it worked fine.

Recently we've had to switch to the F84A... for some reason that won't
program on the board. I tried programming it on a bare board (just the PIC
and connector pins) and it worked, but with other components it seemed to be
useless.

Strangely a guy here has found that by adding capacitance to the MCLR line
during programming it can be made to work... but we're not sure why.

Anyone got any ideas at all?

Thanks in advance,

Dave

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