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
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Other Tags: p3   p0   pull ups   amp   open drain   
Posted by SGH on Sat Apr 21 2007, 06:20 AM

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CLI for 8051(AT89C51)... Read Compelte post
Other Tags: 8051 projects   library api   at89c51   uart   amp   
Posted on Fri Dec 09 2005, 11:56 PM

Conversation

Sun Jun 16 2019, 10:48 PM
hanoch Taub
i need to interface sim800 to 8051, the problem is that on the module sim800 there are 9 pins connector and I don't know how to connect him to 8051, which pins to tx and rx on 8051 module sim there is
Tue May 28 2019, 10:14 PM
Ron Otsig
KBI does not work on P89LPC920 but it works on P89LPC925
Mon May 27 2019, 12:03 PM
BIJI MATHEW
Hello friends....
DragonDad
Tue May 21 2019, 06:02 PM
Hi. Who is online?
Tue May 14 2019, 03:38 AM
Jayson Contreras
Hello
Xkalebar
Sun Apr 28 2019, 12:06 PM
Please provide me the code for gsm based sms controlled notice board
ExperimenterUK
Mon Apr 15 2019, 01:52 AM
@hassan malik post your problem in the "General help Guidance and Discussion" forum
Sun Apr 14 2019, 08:06 PM
RAJESH MAPARi
please send me code to interface atmega32 with 24c1024 serial eeprom
Sun Apr 14 2019, 04:33 PM
hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.please any one help me
Sun Apr 14 2019, 04:32 PM
hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.

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Easwaran22
Thu Jun 13 2019, 10:16 AM
JenniferJJ
Thu Jun 13 2019, 05:12 AM
seyoonnet
Tue Jun 04 2019, 12:37 PM
Charbel
Sun Jun 02 2019, 03:30 PM
ronotsig
Mon May 27 2019, 03:00 AM
WilsonNig
Sun May 26 2019, 03:11 AM
DragonDad
Tue May 21 2019, 02:50 PM
dhiyamtech
Thu May 09 2019, 10:20 AM

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Forum Activity
JenniferJJ Avatar
Posted By JenniferJJ
Thu Jun 13 2019, 05:17 AM
Hi,Hello Members,I am the newbie member, I like ve...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu May 30 2019, 08:32 PM
It occurs to me that although the P89LPC921 and P8...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed May 29 2019, 09:05 PM
I would suggest a fresh approach.The Keil compile...
ronotsig Avatar
Posted By ronotsig
Wed May 29 2019, 03:13 PM
Since the code works for the P89LPC925, it is appa...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon May 27 2019, 06:23 PM
I can't see any reason that those registers would ...
ronotsig Avatar
Posted By ronotsig
Mon May 27 2019, 03:06 AM
I am trying to using P89LPC921 or P89LPC922 in a p...
Ansh12 Avatar
Posted By Ansh12
Sun Apr 28 2019, 02:15 PM
I made a minor change, it works in Proteus.Try the...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Apr 25 2019, 08:20 PM
I made a minor change, it works in Proteus.Try the...
gigyani Avatar
Posted By gigyani
Thu Apr 25 2019, 01:17 AM
when i add cufirst.hex its not working.after 2-3 s...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Apr 24 2019, 12:29 AM
http://www.8051projects.net/download-d205-electron...