Keypad scanner

Details Keypad scanner Keypad scanner

1993-07-21

1997-04-15

Mullen, Thomas

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

379368, H03K 1794

Patent

active

056214022

ABSTRACT:
A keypad scanner for a keypad having a plurality of keys which may be pressed into a down state includes circuitry for detecting when no or any key is pressed down and thereupon generating a no or any key down signal, circuitry for detecting when more than one key is pressed down and thereupon generating a multiple key down signal, and an interrupt generator coupled to the aforementioned circuitry. The interrupt generator itself includes circuitry for detecting a change in no or any key down signal level, circuitry for detecting a change in multiple key down signal level, and circuitry for generating an interrupt signal when either the circuitry for detecting a change in no or any key down signal level or the circuitry for detecting a change in multiple key down signal level detects a change.

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patent: 5264845 (1993-11-01), Kwon et al.
patent: 5404459 (1995-04-01), Gulick et al.
patent: 5408639 (1995-04-01), Gulick et al.
patent: 5420904 (1995-05-01), Gulick et al.

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