lcd help

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Location: calif.

lcd help

Post by mikeb » Wed Jan 28, 2004 11:18 am

Does anyone know the starting line addresses for a 4 line by 16 character lcd display. I know line #1 is at $80 and line #2 is at $C0 I need the address for lines 3 and 4. Thanks for any help you can give.

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Location: Israel

Re: lcd help

Post by chava » Wed Jan 28, 2004 12:12 pm

You should check how meny ROM does the LCD has/<p>I used a 2 line * 16 character LCD and I know that I have extra 24 RAM cells at each end of each line.
I'll explain:
the LCD has 2*40 RAM cells but only 16 out of 40 characters are implemented on this part. As I understand, the RAM moudule of all LCDs is the same' only that in LCDs where not all characters exist the extra RAM can be used for a general use.
hope I helped
Jukin Chava<p>E.Dove Israel

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Location: Australia

Re: lcd help

Post by bodgy » Wed Jan 28, 2004 3:12 pm

4*16 display<p>0x80, 0xC0, 0x90, 0xD0<p>For a 4 * 20<p>0x80, 0xC0, 0x94, 0xD4<p>all assuming HD44780 or clone.<p>
On a clear disk you can seek forever.

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