Don't know if this will help you or not, but we've got a "backpack" for a
t6963 driven
graphic LCD. You can find the code for it on github:
https://github.com/sparkfun/GraphicLCD_Serial_Backpack

In particular, here's the file that relates to controlling the chip:
https://github.com/sparkfun/GraphicLCD_Serial_Backpack/blob/master/Firmware=
/t6963.c

I seem to recall having some issues with pins that I *thought* would be
hi-z being, in fact,
driven, and that was causing me some angst. Might've been a different
driver, though.

Mike


On Fri, Jul 25, 2014 at 12:50 PM, <jim@jpes.com> wrote:

> All,
>
>  I have been trying to control a Graphics LCD that uses the Toshiba 6963
>  controller chip.
>  I have gotten it to display text and graphics. however I have run into
>  an issue that I can't seem to figure out.
>
>  What I'm seeing is I can't write text past column 12 in row 8. The LCD
>  I'm using is a 240 x 64.
>  I have it configured as 30 chars per row, and 8 rows. I have rows 1
>  through 7 displaying text.
>  For place holders in an array that I am using to hold the text, in the
>  first two positions on each row, I have an "L", along with the row
> number (1 through 8).
>  At the end of each row, I have "END" along with the row number (1
> through 8). This is true
>  on all rows except row 8.   On row 8, I can't write past column 12. If
> I try I get nothing
>  on the display, and the port pins
>  act as if the unit is resetting, or drawing too much current and
>  causing the pins to cycle through
>  on and off cycles. If I put the line position back to 12 (0x0C) or
>  less, all is well.
>
>  Also, if I change the OSCON register to anything other than what it is
>  currently, it does the same
>  thing. I have been working on this too long to be objective. Does
>  anyone have any ideas what might
>  be happening?
>
>  I am open to any suggestions, and I would appreciate any insight anyone
>  might have.
>
>  I am using the 16F887 for this project, I am writing the firmware in
>  assembler, and I am using the
>  EASY PIC 6 development board from Mikroelektronika to develop the
>  application.
>
>  Please advise.
>
>  Thanks and Regards,
>
>  Jim
>
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