what we do here is help people understand the problems they discover WHEN they apply themselves to their design. its common to unravel unexpected detail when conquering a design problem and our assistance can enlighten and expedite.

what we don't do as often is help people that aren't applying themselves to their design problem FIRST. these are usually the students with a homework assignment that they haven't even pondered before posting. we read these and realize that there is little chance these people are following the classroom material when they ask such basic questions - and our participation in getting them the answers would serve no purpose; they seldom would go on to choose a career centered around a topic they are not following in the classroom.

students do have good questions posted here and we enjoy helping with those. but your posted question amounts to, "hey i have a micro board, tell me how to output data to the pins"

if you've not read the documentation or examined a list of opcodes, you are not ready to ask your question. i'm sure you are determined to overcome this hurdle, you just need to spend some time reading the 8051 documentation. when you have a concept you want clarified, we'll be glad to help.

just don't say, "make my micro output FF then 00 then AA then stop". that's a job assignment and we all have jobs already. :)

duh