[PIC] Timer1 used as a 1.024ms delay me thinks... (code sample attached)

[Nigel Goodwin]

Which datasheet do you use?

What is the difference to an LCD between 0x28 and 0x20?

0x08

You might try consulting the EPE LCD guide?, it's an excellent introduction to LCD's.

If you check my initialisation above, you have to send 0x20 first, this switches the LCD to 4 bit mode, then you can send 0x28 which sets the rest of that byte up - you can't just send that in the first place, as the lower nibble would be ignored until it's in 4 bit mode.

 

[eng1]

I have a printed copy of the datasheet of the Hitachi 44780 controller. The images on the second link you've posted are copied from there.
You can find the instructions set in the datasheet.