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This is the keypad (kp.) object, it allows you to work with a "matrix" keypad of up to 64 keys (8 scan lines by 8 return lines).
•Flexible keypad arrangement. Scan lines can double as LED control lines too.
•Five distinctive states for each key allow you to create sophisticated keypad input. Individual programming of delay times for each state transition.
•Flexible mapping for scan and return lines -- use any I/O lines, in any order.
•Ability to auto-disable the keypad when a certain key event/code combination is encountered.