Em 2/5/2010 21:14, Philip Pemberton escreveu:
> 5) #define ENABLE              EN=3D1;EN=3D0;
> Ugh. You're raising the pin in one instruction, then lowering it =

> immediately afterwards. The HD44780 isn't quick enough to pick up a =

> 1us-wide EN pulse. You need a minimum of (IIRC) 4us.
>   =



The minimum enable cycle time is 1us (minimum 500ns high followed by
minimum 500ns low) for the old HD44780, half of this for the new HD44780U.


Regards,

Isaac
__________________________________________________
Fale com seus amigos  de gra=E7a com o novo Yahoo! Messenger =

http://br.messenger.yahoo.com/ =


-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist