I had similar problems when interfacing an LCD to an 8051 controller.  Make
sure you are reading/writing data on the correct clock edge and pay close
attention to the chips timing req'ts and the timing you are generating.
Good luck.

Do you know a good source for cheap 2x16 line LCD displays?

Send reply to 'rmudry@bnr.ca'  (I'm not on the list)
Thanks, Rob



In message "Re: Hitachi LCD module", you write:

>Hi,
>
>Many thanks to all who have responded.  I hope  the information is
>useful to other PICLIST readers.
>
>Firstly can I thank all of those who advised me about the Murata 4MHz
>ceramic resonator, it's working fine, and you _can_ connect the middle
>pin to +5V to simplify board layout.
>
>Secondly the LCD module...
>
>I tried my module on the Stamp again, which showed me it was still
>working properly, and I haven't damaged it (relief!).  Back to the '84.
>One problem I think I have is reading the busy flag, so I replaced that
>section with a delay loop.  Now I get some life from the display.  I am
>using portions of Microchips LCD application note, so my code sends 'M'
>'i' 'c' 'r' 'o' 'c' 'h' 'i' 'p' to the 'Send_char' routine.  Deep joy!
>On the display is some text!  Hang on, what does it say?  'Mogwognow'
>
>I have worked out that the middle 2 bits of the lower nibble seem to be
>always set to one, except for the first character (!).  Could it be that
>my SWAPF function is broken inside the CPU?  I don't know,  I shall
>follow people's suggestions and slow it all down some more.  More news
>as it's made.
>
>To anyone else who is using an LCD module with no success:  Take heart,
>and keep trying!
>
>Andy (the other one)