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8051 kit set port 1.

hi everyone.

i was trying to use port 1 pin 7 to do my assignment. there are no other pins for me to use as they are all used up on lcd, relay, keypad and leds. theres this problem when i am using P1.7, when i start running the program, nothing shows up in the serial window of keil c. but when i change the pin to others, it work perfectly.

can anyone tell me how can i get P1^7 to work?

thanks alot.