Key input method and circuit

Details Key input method and circuit Key input method and circuit

1997-08-15

1999-10-19

Horabik, Michael

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 345168, 400477, H03K 1794

Patent

active

059696451

ABSTRACT:
A microcomputer has an output port and an input port. A plurality of switches are provided between and matrix-connected to respective bits of the output port and respective bits of the input port. The microcomputer renders all of the bits of the output port in an output state, and in this state, checks whether an output of the output port is obtained at one of the bits of the input port. When an output of the output port is obtained at one of the bits of the input port, data indicating a manipulated one of the plurality of switches is acquired by rendering, in order, the bits of the output port in an output state, and then the process of acquiring data indicating a manipulated switch is again executed after a lapse of a predetermined amount of time. The acquired data is made effective if a first acquired data and a second acquired data are identical.

REFERENCES:
patent: 4412218 (1983-10-01), Niitsu
patent: 4609908 (1986-09-01), Amano
patent: 5081453 (1992-01-01), Endoh et al.
patent: 5254989 (1993-10-01), Verrier et al.

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