Hi Alvaro,
        I assume that you are sending this with bit 7 high, most data sheets
call the addresses 80-8F and C0-CF to avoid that ambiguity, other wise you
should have no problem, what about a snippet of the source code? pin
assignments, do you have a pin open-collector?

        cya,    Andrew...

> -----Original Message-----
> From: Alvaro Deibe Diaz [SMTP:adeibe@CDF.UDC.ES]
> Sent: Monday, August 30, 1999 5:13 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      LCD DDRAM address problems
> 
> Hi piclisters,
> 
> I have problems trying to make a "locate" in an Optrex LCD. The LCD has
> the
> typicall Hitachi 77480 in it. It is 16char x 2lines, so I suppose the
> DDRAM
> address for the 32 possible locations (without shift) are:
> 
> 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
> 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
> 
> The "Set DDRAM Address" command seems to work OK for the last 15 char in
> each line, but fails with addresses '00' and '40', apparently "hanging"
> the
> 44780. ÀAny ideas?
> 
> Note: the interface is 4-bits long, and the uC a 16C65
> 
> Thanks.