Computer system employing an improved real time clock alarm

Details Computer system employing an improved real time clock alarm Computer system employing an improved real time clock alarm

1994-05-20

1995-06-06

Miska, Vit W.

Horology: time measuring systems or devices

Combined with disparate device

368 28, 368 73, 36470508, G04B 4700, G04B 1924

Patent

active

054228620

ABSTRACT:
A set of I/O indexed configuration registers are provided within a real time clock circuit of a computer system to allow the storage of the day, month and century for an alarm activation event. The I/O indexed configuration registers that store the alarm year, the alarm month, and the alarm day information are shadowed with respect to the I/O indexed configuration registers that store the current year, month, and day information for the real time clock circuit. An additional configuration register mapped within the configuration space of the computer system is provided that stores a bit that controls whether the configuration registers for the current year, month, and day will be accessed during an I/O cycle to a predetermined address of the indexed configuration registers, or whether the configuration registers for the alarm year, alarm month, and alarm day will be accessed during an I/O cycle to the predetermined address. In accordance with the improved real time clock alarm, system software is not required to track the year, day, and month associated with a desired alarm event. In addition, additional I/O space and index space is not occupied as a result of the additional indexed configuration registers. Accordingly, broad system compatibility is maintained.

REFERENCES:
patent: 3999050 (1976-12-01), Pijroda
patent: 5333295 (1994-07-01), Podkowa

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