i need to connect a 4x4 keypad to PIC16F877A. i have read about some pull up resistors needed to perform this connection and i don't quite get it. do they need to be connected on all the 8 lines (4 rows, 4 columns) of keypad. if yes, how?
also i have read somewhere that if keypad is being connected to portB of PIC then these resistors aren't needed. is that true? i am using port B only and confused about whether or not to use the resistors.
also i have read somewhere that if keypad is being connected to portB of PIC then these resistors aren't needed. is that true? i am using port B only and confused about whether or not to use the resistors.