Dear friends,

i was using 89C51 for my application.

when i probe the port pin (one pin in port P2)it's giving data out on serial. (This pin is connected from another processor and the port pin in that processor is P1)

i will read P2 pin in external interrupt zero, when ever i receive 8 bits i am trying to out data on serial port.

but if i don't put probe on that pin no data is coming out.

could any body suggest remedy for this?>

i tried with a Pull-Up value of 10K but didn't succeded.