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AT89S51 + 16x2 LCD


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SGH

Fri Apr 20 2007, 11:20PM

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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

p3 p0 pull ups amp open drain

Ajay

Sat Apr 21 2007, 06:23AM

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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.

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pullups p0

SGH

Sat Apr 21 2007, 08:51AM

Registered Member #672

Joined: Tue Mar 06 2007, 10:47PM

Posts: 38
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Thanks Rickey.

Regards,
SGH

rickey sgh