On 2010-08-07 00:52, Carl Denk wrote:
> Good thought, just tie RW low, and that gives me an extra pin. Easily
> done. I don't see any reason to read the LCD. It's a very simple format
> that is stationary. The RA1 is cmos output, and TTL input.
>
> I guess what I don't understand, There are many examples of connecting a
> PIC 18 to a 44780 LCD, and none show this extra stuff. It appears the
> chip programs OK without the LCD attached, but doesn't display anything.
> But that's getting ahead a bit, and if after spending some time and
> research is a new topic. First I need to get the PICKIT 2 working
> correctly. I have used the PICKIT 2 previously with no problems, but
> none of the programing pins had anything else connected.

Now, the PICkit2 should have no problem at all with the attached
LCD, *if* the LCD is not driving the data lines at the same time.

Tie RW low and disconnect it from the PIC and se what happens.
Simple test that takes a few minutes...

If that doesn't work, try with one resistor in series with the
data lines (PICkit2 attached at the PIC side of the resistors).
Say 1k - 4.7k or something. Not to large, the PIC has to be able
to pull-down the data lines (which has pull-ups inside the
HD44780 controller).


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