hi to all i am using at89c55wd the problem is when i tried to toggle the P3 all bit i.e. P3.0,1,2,3,4,6,7 changes its state expect P3.5 i used timer 0 as timer after 1 sec i invert the P3. position by P3=~P3 but P3.5 unchanged all other toggle between 0 and 1.P3.5 toggle properly on simulator but not at h/w side.
i tried it by changing the perticuler bit i.e. P3.5 but did not work please help me
"i cheacked socket pin and controller pin continuty on multimeter and its fine."
What you need to check is for shorts or whatever on the board that are keeping the pin pulled down!
BTW: the spelling is "checked"
i checked it with ground there no shorting nothing wrong with it the port is pullup by 10kohms.