Electronic timepiece calendar circuit

Details Electronic timepiece calendar circuit Electronic timepiece calendar circuit

1976-12-10

1978-10-03

Schaeffer, Robert K.

58 855, 58 58, G04B 1924

Patent

active

041176570

ABSTRACT:
An electronic timepiece calendar circuit whereby the display of at least the date is automatically effected during both leap years and non-leap years is provided. The electronic timepiece calendar circuitry includes a date counter that is indexed by a count of one from a count of one to at least 31 and thereafter is returned to a count of one to begin counting the dates of the next month. A month counter is provided for being indexed by one through a count of one to at least 12 each time the date counter is returned to a count of one and further is adapted to produce a signal representative of the count thereof. A control circuit is provided for receiving the month signal produced by the month counter and in response thereto returns the count of the day counter to one when the count of the month counter is two and the date counter is changed from 28 to 29 or from 30 to 31 depending on whether a leap year signal is applied thereto. The leap year signal is produced by year circuitry including a first year counter adapted to be indexed through a counting cycle of one to nine and a ten year counter series connected to the year counter that is adapted to be indexed through at least one odd and even counting cycle in response to each return of the month counter to a count of zero. A judging circuit is provided for detecting when the count of the year counter is zero, four and eight and the count of the 10 year counter is even, or alternatively, when the count of the year counter is two or six and the count of the 10 year counter is odd, and in response to detecting either alternative, applying a leap year signal to the control circuit.

REFERENCES:
patent: 3961472 (1976-06-01), Riehl

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