> I am driving a 44780 LCD display 4 bit data mode with an 18F1320 with
in
> the common way, the 4 data signals are driven by RB4 - RB7. Using a
> PICKIT2 to program and debug the board. RB7 and RB6 are dual function
> also as PGC and PGD. I get an error when trying to program or debug
with
> this setup. The error goes away  if I unplug the display ribbon cable.

These displays have internal weak pull up resistors, but I wouldn't
think they would be enough. It may be the total capacitive load that
ends up on the programming pins upsetting the clock and data rise & fall
times.
--=20
Scanned by iCritical.

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.