Keyboard scanning circuit

Details Keyboard scanning circuit Keyboard scanning circuit

1994-10-18

1996-08-06

Peng, John K.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, 379368, 36470912, H03K 1794

Patent

active

055437869

ABSTRACT:
A keyboard scanning circuit for detecting additional user selected functions on a keyboard while the keyboard is being "debounced". The scanning circuit permits the scanning for additional functions without the need for additional scanning ports by detecting whether a row port of the scanning circuit is connected to a source voltage via a resistor, a ground via a resistor, or is floating. The user or the manufacturer using the circuit can set the switches which establish the status of these additional functions.

REFERENCES:
patent: 4498073 (1985-02-01), Fisher et al.
patent: 4617554 (1986-10-01), Krause et al.
patent: 4758829 (1988-07-01), Smith III
patent: 4825464 (1989-04-01), Wen
patent: 5220601 (1993-06-01), Gulick et al.
patent: 5235331 (1993-08-01), Sato
patent: 5235635 (1993-08-01), Gulick
patent: 5274371 (1993-12-01), Yang et al.
patent: 5285495 (1994-02-01), Wu et al.
patent: 5381142 (1995-01-01), Simmons, Jr.
patent: 5463386 (1995-10-01), Wu

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