Bi-directional keyboard interface circuit

Details Bi-directional keyboard interface circuit Bi-directional keyboard interface circuit

1988-02-08

1989-10-17

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

34081513, 34081514, H03M 1100

Patent

active

048750433

ABSTRACT:
The present invention includes a keyboard encoder which encodes a key selected by an operator. The encoder is isolated from a bi-directional bus by an isolation circuit. When a key has been selected a key code is made available for reading by a separate CPU. The separate CPU enables transfer of the key code from the encoder to the bi-directional bus and then reads the key code. The separate CPU acknowledges receipt of the key code and provides feedback to keyboard operator by sending a bank and light selection code to the keyboard over the bi-directional interface bus, after the isolation circuit has been reactivated and after a function, to be performed by the separate CPU and specified by the key code, has been started. The isolation circuit prevents the key code and the bank and light selection code from becoming intermixed on the bi-directional bus. The bank select code is used to select a bank of light code decoders which activate a light corresponding to the light code. The light activated stays lit until another key is selected. The transmission of a second bank and light selection code after a single key is selected can be used to activate an additional light associated with the selected key.

REFERENCES:
patent: 4278966 (1981-07-01), Hemsher
patent: 4313109 (1982-01-01), Funk et al.
patent: 4454596 (1984-06-01), Wunsuh et al.
patent: 4459581 (1984-07-01), Wilson et al.
patent: 4679135 (1987-07-01), Kobayashi et al.

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