http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 04 Dec 2008 16:26:23 -0800 http://backend.userland.com/rss092 i m given a task to use AT89C51ED2 which is one member of 8051 family . if i using it to interface a LCD via port 2 , do i nid to put pull up resistor <noauthor@nospam.com> http://www.8051projects.net/forum-t10364.html P2 does not requires external pull up resistor as P2 already has internal pull up resistor. Only P0 requires external pull up resister when interfacin ntung<ntung8@nospam.com> http://www.8051projects.net/forum-t10364.html