AT89S51 + 16x2 LCD

Hi Rickey, I'm trying to write some code for above parts.

1). For 8-bit operation : P0.0 - P0.7 for data and P3.2, P3.3 & P3.4 for RS, RW and E. Will I have problem with Port O as it is an open drain type ?. Will I need pull ups resistor for P0 ?.

2). For 4-bit operation : P0.4 - P0.7 for data and P3.2, P3.3 & P3.4 for RS, RW and E. Same question as above.

Thanks,
SGH

Pullups are must.. there is no problem in using P0. all ports are same, the only difference is.. that.. P0 need pullups. you can use any pin you want and consider it as a normal port.

Thanks Rickey.

Regards,
SGH