Electronic timekeeping device reduced adjustment data storage re

Details Electronic timekeeping device reduced adjustment data storage re Electronic timekeeping device reduced adjustment data storage re

1994-11-14

1996-01-02

Miska, Vit W.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368201, G04B 1800

Patent

active

054815070

ABSTRACT:
To produce a time-base signal for timekeeping, an oscillator circuit generates an oscillator clock signal, which is counted cyclically with a programmable cycle length to establish a time-base cycle. The time-base signal is set and reset once in each time-base cycle. The oscillator clock signal is also counted with a fixed cycle length to establish an adjustment cycle, which is longer than the time-base cycle. In each adjustment cycle, the length of one or more time-base cycles is altered by a total amount determined by adjustment data stored in a non-volatile memory, then the time-base cycle length is restored to its nominal value. The average frequency of the time-base signal can be adjusted by writing appropriate adjustment data in the non-volatile memory.

REFERENCES:
patent: 4407589 (1983-10-01), Davidson et al.
patent: 4456386 (1984-06-01), Dellea
patent: 4707145 (1987-11-01), Ishida
patent: 4708491 (1987-11-01), Luitje
patent: 4903251 (1990-02-01), Chapman
patent: 5327404 (1994-07-01), Nolan

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