Self-scan programmable keypad interface

Details Self-scan programmable keypad interface Self-scan programmable keypad interface

2006-05-05

2008-11-04

Edwards, Jr., Timothy (Department: 2612)

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

C341S022000, C341S026000

Reexamination Certificate

active

07446676

ABSTRACT:
Various embodiments are disclosed relating to a self-scan programmable keypad interface. In an example embodiment, an apparatus is provided that includes a processor, and a keypad interface circuit. The keypad interface circuit may include a detection circuit to detect when one or more keys of a keypad have been pressed, a scan circuit adapted to generate signals for keypad scan to identify one or more keys that have been pressed, a debounce circuit to debounce signals, and a key status register adapted to store a status of one or more keys of the keypad obtained during keypad scan. The processor is adapted to read contents of the key status register to identify one or more pressed keys upon receiving a signal from the keypad interface circuit.

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