plz make me understand how to interface

Oh well we can just try. But how far we succeed depends on lots of factors.

There is no point wasting time taking lectures on basic stuff here. Any book worth its name on 8051 will most defenitley have this stuff explained in great detail.

Anyway these links by some experts from this forum will be useful :

http://www.specs.de/~danni/ap.../index.htm

http://www.8052.com/forum/read.phtml?id=31164

Help yourself.

Raghu