Method and circuit for backing up memory and calender

Details Method and circuit for backing up memory and calender Method and circuit for backing up memory and calender

1998-10-19

2000-12-19

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Computer power control

713310, 713330, 713340, 713100, 702 58, 702 61, 702 63, 705401, 705410, 307 66, G06F 126, G06F 128

Patent

active

061638463

ABSTRACT:
Disclosed is a method far backing up memory and calendar, which has the steps of: providing a back-up power source for the calendar separated from the back-up power source for both the memory and the calendar; and continuing to back up the calendar by the separated back-up power source even after stopping the backing-up of the memory. Also disclosed is a circuit for backing up memory and calendar, which has a first power source circuit to supply back-up current to both the memory and the calendar; and a second power source circuit to supply continuously back-up current to the calendar when the supply of back-up current to the memory stops due to reduction in the capacity of the first power source circuit.

REFERENCES:
patent: 4701858 (1987-10-01), Stokes et al.
patent: 5293494 (1994-03-01), Saito et al.
patent: 5596512 (1997-01-01), Wong et al.
patent: 5790873 (1998-08-01), Popper et al.
patent: 5946672 (1999-08-01), Chrosny et al.

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