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Thanks for all the replies. The module is working now, so I thought I'd=20
explain why in case it helped some other noob.

I was using Microchip AN587  as my guide because it seems to have lifted=20
stuff from the HD44780 spec, and it goes further, of course, by presentin=
g=20
implementation detail.

However, I finally managed to extract a spec for the PC1602F from Powerti=
p.=20
It is a pretty sparse document, but it did tell me  that the 1602F uses t=
he=20
Sitronix ST7066U, and not the HD44780, as the LCD controller/driver. They=
=20
are almost compatible devices, but the key difference I found was that th=
e=20
ST7066U has a much longer settling time after power-up than the HD44780 -=
=20
40mS as opposed to 15mS.

The ST7066U also has a simpler "Initialize by Instruction" sequence,=20
although I currently have the HD44780 sequence, as does John Sanderson, a=
nd=20
it works OK.

When I put a 50mS delay in the front of my driver code, with infinite rel=
ief=20
I found that now the device worked.

I note that John Sanderson uses 100mS in his code.

So thanks again, all.
Phil.

_________________________________________________________________
Windows Live=99 Messenger has arrived. Click here to download it for free=
!=20
http://imagine-msn.com/messenger/launch80/?locale=3Den-gb


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