Re: [uCsimm] LCD weirdness

From: David Williams (
Date: Fri Mar 24 2000 - 17:20:19 EST


Sounds like a timing problem to me. I would be looking at what happens
near LFLM transitions. I have used a custom LCD display interfaced to
68EZ328 without problem.


Tom Walsh wrote:

> Has anyone experienced unexpected inverse video when using a 1/4
> (Sharp LM32019) or full vga (Epson EG9013) LCD displays? I have yet
> to put a 'scope onto the data lines, but it is related to the value of
> the first byte of the first line at the start of a frame. If this
> byte is set to 0xff, then the bitstream for that frame will be
> reversed, else if the the byte is 0x00, the bitstream is displayed as
> expected (normal video). No other byte value at any other location
> within the display memory has this effect, only the first byte pumped
> out at the beginning the Frame has this effect.
> Is this an "undocumented feature"?
> TomW
> --
> Tom Walsh - WN3L - Embedded Systems Consultant
> '', ''
> "Windows? No thanks, I have work to do..."

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