Real time clock using computer and separate counting means

Details Real time clock using computer and separate counting means Real time clock using computer and separate counting means

1979-03-14

1981-12-01

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92T, 235 92CC, G06M 312

Patent

active

043038506

ABSTRACT:
Apparatus for maintaining a real time clock normally incremented by a CPU when power is provided thereto and maintained by a separate counting means when power is removed from the CPU, the separate counting means powered independently of the CPU power source. Apparatus is also disclosed for synchronizing the separate counting means such that the real time clock maintained by the CPU may be updated for the time interval in which the CPU was inoperative without loss of real time clock accuracy.

REFERENCES:
patent: 3946219 (1976-03-01), Lucas
patent: 4031363 (1977-06-01), Freeman et al.
patent: 4089058 (1978-05-01), Murdock
patent: 4168531 (1979-09-01), Eichelberger et al.
patent: 4189635 (1980-02-01), Sheller

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