Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1994-01-31
1994-10-18
Miska, Vit W.
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
371 61, 379279, G04F 500, G04F 104
Patent
active
053574915
ABSTRACT:
A clock stoppage detector and a selector selection determining circuit are provided on each of a plurality of circuit boards. If any abnormality is detected in the clock selected in accordance with selector control information supplied from a clock selection controller provided common to the plurality of circuit boards, the selector selection determining circuit changes the selection independently of the selection control information. The selector selection determining circuit also performs clock selection independently when failure occurs to the clock selection controller.
REFERENCES:
patent: 4254492 (1981-03-01), McDermott, III
patent: 4322580 (1982-03-01), Khan et al.
patent: 4490581 (1984-12-01), Edwards et al.
patent: 4538272 (1985-08-01), Edwards et al.
patent: 4653054 (1987-03-01), Liu et al.
patent: 5291528 (1994-03-01), Vermeer
Fujitsu Limited
Miska Vit W.
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