Electronic timepiece in which an input terminal of the integrate

Details Electronic timepiece in which an input terminal of the integrate Electronic timepiece in which an input terminal of the integrate

1978-11-07

1981-02-10

Weldon, Ulysses

Horology: time measuring systems or devices

Regulating means

368185, 368186, 368187, G04B 1712

Patent

active

042505747

ABSTRACT:
The invention relates to an electronic timepiece in which an input terminal of the integrated circuit is used as an output terminal. During the manufacturing of the timepiece it is important to check the running of the frequency of the oscillator and the operation of at least part of the frequency divider chain. However, in a timepiece, the places available for obtaining measurements could be very limited, and the timepiece does not generally have an output terminal adapted to connect the signal to be measured to an external counter. The purpose of the invention is to utilize an already existing input terminal as an output terminal for permitting a precise and rapid checking of the frequency of the oscillator by measuring, on that terminal, a signal of intermediate frequency delivered by the frequency divider chain. A decoupling circuit permits the terminal to be utilized as an output terminal because it is arranged such that a logic signal delivered to its input is transmitted to its output to the exclusion of the signal of intermediate frequency.

REFERENCES:
patent: 3998044 (1976-12-01), Yamauchi et al.
patent: 4081951 (1978-04-01), Hersberger
patent: 4133169 (1979-01-01), Scherrer et al.
patent: 4147022 (1979-04-01), Ichikawa

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