Are there anyone can help me how to access Port 0 and Port 2 of AT89C52 ?
I set EA pin to VCC (internal program memory)
I use test command:


start :
mov p0,#55h
mov p0,#55h
mov p2,#aah
mov p2,#55h
sjmp start

to make clock signal. But it didn't show up ! Do I have to set some register or memory ?