Selection switch memory circuit

Details Selection switch memory circuit Selection switch memory circuit

1976-06-30

1978-02-14

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340152R, 84 101, H04Q 900

Patent

active

040742334

ABSTRACT:
A selection switch memory circuit having a priority encoder for providing a code for the highest priority actuated one of a plurality of momentary contact selection switches, a memory for storing the code and a decoder for providing a select signal on one of a plurality of outputs thereof to activate a circuit corresponding to the stored code. A control includes a comparator to determine if the provided code is the same as the stored code. In one embodiment, if the provided and stored codes are the same, the memory is cleared of the stored code, and the circuit corresponding thereto is deactivated. In another embodiment, the decoder is disabled to terminate activation of the previously selected circuit if the provided and stored codes are the same. In both embodiments, if the provided and stored codes are different, the provided code is entered into the memory in lieu of the stored code. Response of the control to switch actuation is delayed to avoid deleterious effects of switch contact bounce.

REFERENCES:
patent: 2995729 (1961-08-01), Steele
patent: 3660683 (1972-05-01), Wangard
patent: 3803594 (1974-04-01), Klein
patent: 3818447 (1974-06-01), Craft
patent: 3833884 (1974-09-01), Bigbie

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