Real time keyboard scanner

Details Real time keyboard scanner Real time keyboard scanner

1992-09-22

1995-10-10

Peng, John K.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, 364189, H03M 1100

Patent

active

054574552

ABSTRACT:
The REAL TIME KEYBOARD SCANNER shown herein provides scanning and debouncing, but not multiple key resolution or buffering. At the end of each keyboard scan, the scanner produces a code indicating which key was depressed, or that no key was depressed, or that multiple keys were depressed. If this code is the same as the code in a valid-key register, then no change is made to the valid-key register and no debouncing is performed. If the codes differ, then debouncing is performed. The CPU served by the scanner can examine the code in the valid-key register whenever it finds such examination to be convenient, and need not tie up valuable processing time in continuously monitoring the valid-key register. If desired, an interrupt may be sent to the CPU when the code in the valid-key register is changed.

REFERENCES:
patent: Re31736 (1984-11-01), Mueller et al.
patent: 3743755 (1973-07-01), Watson
patent: 3886543 (1975-05-01), Marin
patent: 3936828 (1976-02-01), Muesse et al.
patent: 3973256 (1976-08-01), Stoesser et al.
patent: 4100606 (1978-07-01), Brantingham
patent: 4339134 (1982-07-01), Macheel
patent: 5285495 (1994-02-01), Wu et al.

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