Hi, if a 3x4 keypad is connected to port 0 of 89c51. all pins on port 0 need to connect pull up resistor or not?
if a 3x4 keypad is connected to port 0 of 89c51. all pins on port 0 need to connect pull up resistor or not? no answer possible because derivative not specified method not specified Erik
"no answer possible" Rubbish! Two answers are possible: 1. Yes. 2. No.
OK, you win
i try to apply a program of 3x4 keypad that connect to port 2 of 8051 into my project using port 0. the keypad does not work. howcome?
show connections and code