Index of /Software/PIC/keypad
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keypad-1.34a.zip 23-Jun-2002 02:41 218K
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keypad-board.jpg 23-Jun-2002 02:09 126K
'keypad' is a PIC based system for decoding switch matrix type numeric
keypads with up to 4 rows and columns. The keypad switch matrix is
read, and if a key is pressed, it is converted into an equivalent
binary value (0-0fh) for output. Full debounce logic is included to
suppress mechanical switch bounce effects.
Output can either be a 4-bit parallel word or a serial clocked output.
Both serial and parallel outputs support a "latching" pulse to drive
external interface timing.