Excuse me if my english fail.

I need to write some data to port P0. To do it i used one code like:

MOV A,#SBUF
MOV P0,A
MOV P1,A
MOV P2,A

The SBUF (data received from serial), is writed correctly to the ports P2 and P1, but not into the port P0. I used one LED to see these results. The only adtional hardware conected to the 89s52 is the MAX232, for the serial interface.

Where is the problem?