Hi,
I had been using 20x2 LCD modules controlled by 44780. There I used command #80h to bring cursor to first char. of Row1.
#80h was combination of #80h command for address, and #00h the row+char address. I may send the cursor to Row1, Char 10 by sending command #8Ah, #80h+#0Ah.

For 2nd row I have to add, #40h to base command #80h, that was all together #C0h.

Now I have to use 20x4 LCD module, (which i have not bought yet). And wants to make sure what I understood from 44780 manual.

I understand that from #00h to #28h (40 char) will be considered row1. Means row1 and row2 can be addressed in series such as they would have been same row.

I mean 20x4 will work like 40x2 as far as addressing is concerned.

Can some one confirm this with me. If I misunderstand so can some one let me know how the addressing scheme 20x4 LCD would have with Hitachi 44780 controller?

Rauf