Data input apparatus having a microcomputer

Details Data input apparatus having a microcomputer Data input apparatus having a microcomputer

1990-08-10

1991-10-15

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, H03M 1120

Patent

active

050578367

ABSTRACT:
A data input apparatus having a first group of lines extending parallel to one another, and a second group of lines extending parallel to one another and intersecting with the lines of the first group at right angles. The apparatus also has groups of key switches located at the intersections of the lines of the first group and the lines of the second group. The lines of the first group are connected to the output ports of a microcomputer. Low-Level pulses are periodically supplied to these lines at different times. The apparatus further comprises a serial circuit including a group of first resistors each connected between adjacent lines of the second group. A voltage source is connected at a connecting point to one end of this serial circuit through a second resistor. The connecting point of the serial circuit and the second resistor is coupled to the input port of the microcomputer. The microcomputer determines which key switch has been operated, in accordance with the voltage applied to the input port at the time a low-level pulse is supplied to the corresponding line of said first group.

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patent: 4862166 (1989-08-01), Yamakawa
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Halbleiter-Schaltungstechnik, Springer-Verlag Berlin Heidelberg, New York 1978, pp. 568-575.

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