On-chip frequency trimming method for real-time clock

Details On-chip frequency trimming method for real-time clock On-chip frequency trimming method for real-time clock

1990-11-27

1994-07-05

Miska, Vit W.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

G04B 1800

Patent

active

053274040

ABSTRACT:
Apparatus for digitally trimming the output frequency of a real-time clock is disclosed. The output frequency of a divider chain is adjusted by the contents of a trim constant register. The amount of correction and direction (slow or fast) to be effected is determined by the trim constant register. During "slow" real-time clock operation, the divider chain "shortens" the next second produced by the real-time clock. During "fast" real-time clock operation, the production of the next second is blocked and then a portion of the "blocked" signal is "added back" to effectively "lengthen" the next second produced by the real-time clock.

REFERENCES:
patent: 4043109 (1977-08-01), Numabe
patent: 4101238 (1978-02-01), Aihara et al.
patent: 4154053 (1979-05-01), Chetelat et al.
patent: 4300224 (1981-11-01), Nakazaki et al.
patent: 4408897 (1983-10-01), Mutrux
patent: 4464061 (1984-08-01), Kamiya
patent: 4763309 (1988-08-01), Descombes

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