Good thought, just tie RW low, and that gives me an extra pin. Easily=20
done. I don't see any reason to read the LCD. It's a very simple format=20
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=20
PIC 18 to a 44780 LCD, and none show this extra stuff. It appears the=20
chip programs OK without the LCD attached, but doesn't display anything.=20
But that's getting ahead a bit, and if after spending some time and=20
research is a new topic. First I need to get the PICKIT 2 working=20
correctly. I have used the PICKIT 2 previously with no problems, but=20
none of the programing pins had anything else connected.

On 8/6/2010 6:18 PM, Jan-Erik Soderholm wrote:
> On 2010-08-06 21:35, Carl Denk wrote:
>   =20
>> The LCD control lines are as follows:
>> RS>   RA4
>> RW>   RA1
>> E>   RA0
>> I see that RA4 is open drain, and needs a pull somewhere,
>>     =20
> If anything, it should be "up".
>
>   =20
>> probably
>> should be high to not write to the LCD unless intentionally writing.
>>     =20
> RS controls *where* to write (or read), not if one writes or not.
>
>   =20
>> Will try 10k ohms. alternately I could move RS to RA3 that only has an
>> activity LED now.
>>     =20
> Again, it was the *RW* line I was specificaly asking about.
> Does RA1/RW has a pulldown to GND ?
> Are you going to read from the LCD at all ?
> If not, just pull/tie it low and save a PIC I/O-pin...
>
>
>
>   =20
>> Thanks on that point.
>>
>> Thanks everyone too. :)
>>     =20
--=20
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