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. en-gb 2008-12-02T00:18:52-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t9424.html 2008-12-02T00:18:52-08:00 what is the state of ports of 8051 family on reset???also even if its FFFFFFh by default then why we have to write 1's in order to configure it as input port??please help http://www.8051projects.net/forum-t9424.html 2008-12-02T00:18:52-08:00 Ajay ports are input by default that means 1 or High.For more information on why its like this.. open 8051 User manual (from Intel) and see the internal construction of I/o ports. you will find latches and buffer there for reading and writing to port. Just read and look at the construction diagram you will get your answer yourself. If you still feel any problem understanding it then, I will explain it