Logic circuit for use in two or three button digital watch

Details Logic circuit for use in two or three button digital watch Logic circuit for use in two or three button digital watch

1976-08-02

1978-10-17

Schaefer, Robert K.

58 23R, G04B 2700

Patent

active

041201485

ABSTRACT:
A logic circuit subsection of a digital watch integrated circuit (IC) chip which enables the final watch electronics module to determine whether it is in a two or three button watch. The IC chip then uses this information to alter the pushbutton responses so that it is appropriate for either a two or three button watch.
The logic circuit of the present invention consists of a plurality of logic gates in combination with latching means which cause the digital watch to be in either a two or three button mode.
In the two button digital watch, by placing the batteries in the watch the circuit of the present invention causes the watch to be in the two button mode, and to thereby function as a two button watch. Simultaneous depression of both of the watch's buttons will also cause the watch to be in the two button mode.
In the three button watch, depression of the third button will cause the watch to be in the three button mode and to thereby function as a three button watch.

REFERENCES:
patent: 3871170 (1975-03-01), Bergey
patent: 3984973 (1976-10-01), Ho

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