The Clear Display and Cursor Home commands have variable
execution times and they take MUCH longer to execute than
all other instructions.  You need to have a long delay of
up to 1.64 Milliseconds following these commands, before you
send the next instruction.

That could be it (or it could not), but that's my only idea.

Andrew





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---- On    , Haris I. Volos (pic@HIVOLOS.COM.CY) wrote:

> Hi!
> I am using an HD44780 compatible display with a 16F877
everything works
> fine
> expect when I clear the display or I send the cursor home
command to the
> LCD, then whatever characters I send to the display are NOT
displayed! I
> have tried to set again the Entry Modes, Display ON/OFF but
no result.
> If I
> move the cursor manually i.e set DDRAM address command
instead using the
> above commands all are ok.
>
> The LCD is made by trident and it states that is fully
compatible with
> HD44780 so it doesn't provide a datasheet. I have the Hitachi
datasheet
> and
> doesn't state anything about the problem.
>
> Any ideas?
>
> Thanks in advance,
>
> Haris Volos
>
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