Dang I think i just made a mistake the other day, i was messing with a 4x4 matrix keypad and i was using the special 922 chip to interface it to the PIC, but i was getting mad because it triggered the INT but it looks like I may have had it set up on the falling edge? when i pressed a keypad button nothing happened, but when I released it , the led to detect a interupt firing flashed but no data read because now no key is pressed, i was going to custom build a pic to interface with that keypad, but now i need to rebuild circuit and see if i can chage the INT edge. feel frusterated. Alot of people have gotten away from using the 922 chips and many manufacturers have stopped making them, but it makes keypads very simple. still learning here and at least seeing the code for leading/falling edge triggered the memory. ive got several keypads and those 922 chips that i would love to use if i can get them to work.
thanks