Remote control unit having additional keys serviced via an inter

Details Remote control unit having additional keys serviced via an inter Remote control unit having additional keys serviced via an inter

1993-02-19

1995-01-10

Hofsass, Jeffery A.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

200 5A, H03K 1794

Patent

active

053811429

ABSTRACT:
In a remote control unit, a controller is coupled to first and second pluralities of keys for determining which of the keys is depressed at any given time. The first plurality of keys is coupled between a group of drive lines and a group of sense lines. The second plurality of keys is coupled between the sense lines and to an interrupt input port of the controller. A key pressed in the first plurality of keys causes a first kind of interrupt, and a key pressed in the second plurality of keys causes a second kind of interrupt. In response to one of the first and second interrupts, the controller interrogates the keyboard to determine which key is pressed.

REFERENCES:
patent: 4591833 (1986-05-01), Ishii et al.
Nixon, "4-By-Matrix Chip Encodes Larger Arrays", Electronics, Apr. 1980, vol. 53, No. 10, p. 133.
Buurma et al., "Expand a Keyboard Matrix by Adding Isolation Diodes", Electronic Design, Dec. 1978.

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