Real-time clock having programmable time initialization and read

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235 92T, 235 92PE, 235 92DP, G06F 104

Patent

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041685318

ABSTRACT:
A group of selectably-loadable counters is used to derive timekeeping information, for use in an energy load control system, by counting the accurate pulses obtained from a crystal-controlled oscillator and a divider chain. A back-up battery is used to allow the oscillator, dividers and counters to continue the timekeeping function even if normal power, obtained from power mains, is temporarily lost. An address decoder and input/output bus drivers interface with the counters to allow date, hour and minute time information to be routed to, or received from a data bus and under programmable control, when the clock is used in a microcomputer-based system.

REFERENCES:
patent: 3813533 (1974-05-01), Cone et al.
patent: 3984662 (1976-10-01), Sorenson
patent: 4060720 (1977-11-01), Check, Jr.
patent: 4065663 (1977-12-01), Edwards
patent: 4078374 (1978-03-01), Konda
patent: 4078376 (1978-03-01), Freeman
patent: 4080780 (1978-03-01), Williams et al.
patent: 4081664 (1978-03-01), Washizuka et al.
patent: 4085575 (1978-04-01), Tanaka
W. Nadler et al., "A Computer Read/Write Clock", in Computer Design, vol. 13, No. 9, Sep. 1974, pp. 102, 104, 106.

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