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Tag: p0

AT89S51 + 16x2 LCD
Forum -> Project Addition or Changes
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.

pullups   p0   
Posted by Ajay on Saturday 21 April 2007 - 06:23:51

AT89S51 + 16x2 LCD
Forum -> Project Addition or Changes
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   
Posted by SGH on Friday 20 April 2007 - 23:20:14



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8051 Microcontroller Projects 8051 AVR tutorials PIC microcontroller, 8051 assembly language programming electronics and communication ECE CSE pdf ebooks library BE final year project ideas Embedded systems