i confused!!!!
i read that for using port as output i dont need to do anything..
but for using port as input first loading the port with #0ffh ....initially its ok! my port1 is connected to a/d converter...and every 100microsec new value comes to port1...after first reading isnt the port1's value changed when the second data comes!!! and after reading port1...is it possible to read second data by not making the port1 #ffh .....you said that read bible! ok i read but it is not clear!