MC68HC11(Axide CME11E9) Keypad Scan

Simple keypad scan source needed. I need to have a program that will scan a key if pressed on a 4x4 (16 key) keypad. I need the board to operate in expanded mode not single chip mode. That means that the 8 pins on the keypad have to be connected to port D and port E (4 pins each). I want to have the ascii value of the detected key stored in an accumulator. ## Deliverables 1)I just require the source in .txt, .h, or .asm as long as I can build the source and run it in buffalo. ## Platform windows 2000