Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1992-05-01
1996-05-28
Peng, John K.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 20, 341 24, H03M 1100
Patent
active
055215750
ABSTRACT:
A key signal input circuit for a microcomputer including a microprocessor and a single input port. The microcomputer outputs, in sequence at a constant interval, a plurality of grid signals, receives different key signal inputs successively through the single input port synchronously with the grid signals, and discriminates the inputted key signals to recognize which keys have been selected. The key signal input circuit includes a power supply circuit, responsive to the grid signals from the microcomputer, having a plurality of power supply lines for supplying, in sequence at a constant interval, a desired power through the power supply lines. A key matrix circuit having a plurality of sets of keys, responsive to the desired power through the power supply lines from the power supply circuit and to on/off states of the keys, coupled, by sets, respectively to the power supply lines. The key matrix circuit applies the key signals successively to the microcomputer.
REFERENCES:
patent: 4583189 (1986-04-01), Koyama
patent: 4872008 (1989-10-01), Ohtsuka et al.
patent: 4918634 (1990-04-01), Nishimori
patent: 5057836 (1991-10-01), Inaba
patent: 5182769 (1993-01-01), Yamaguchi et al.
Gold Star Co. Ltd.
Peng John K.
Wu Daniel J.
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