Most likely, your controller chip is running out of RAM memory. did you che=
ck the data sheet for the Toshiba 6963?

Jean-Paul
AC9GH

On Jul 25, 2014, at 2:50 PM, jim@jpes.com wrote:

> All,
>=20
> 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.=20
>=20
> 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).=20
> At the end of each row, I have "END" along with the row number (1
> through 8). This is true=20
> on all rows except row 8.   On row 8, I can't write past column 12. If
> I try I get nothing=20
> 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=20
> on and off cycles. If I put the line position back to 12 (0x0C) or
> less, all is well.
>=20
> Also, if I change the OSCON register to anything other than what it is
> currently, it does the same=20
> thing. I have been working on this too long to be objective. Does
> anyone have any ideas what might=20
> be happening?
>=20
> I am open to any suggestions, and I would appreciate any insight anyone
> might have.
>=20
> I am using the 16F887 for this project, I am writing the firmware in
> assembler, and I am using the=20
> EASY PIC 6 development board from Mikroelektronika to develop the
> application.=20
>=20
> Please advise.
>=20
> Thanks and Regards,
>=20
> Jim
>=20
> --=20
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