Method and apparatus for detecting supply power loss

Details Method and apparatus for detecting supply power loss Method and apparatus for detecting supply power loss

1997-11-26

1999-10-05

Paladini, Albert W.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 3645283, 36452828, 365229, H02J 700

Patent

active

059629304

ABSTRACT:
A microprocessor system includes a microprocessor and a first controller. The first controller is coupled to the microprocessor, and the first controller includes a first memory adapted to store a power loss indicator. A method for detecting a reduction of a power supply voltage in a microprocessor system includes coupling the power supply voltage to a first memory of a controller. A power loss indicator is stored in the first memory. The occurrence of a predetermined event is detected, and the first memory is read in response to the predetermined event to determine if the power loss indicator is intact.

REFERENCES:
patent: 4638175 (1987-01-01), Bradford et al.
patent: 4675538 (1987-06-01), Epstein
patent: 4779007 (1988-10-01), Schlanger et al.
patent: 5019717 (1991-05-01), McCurry et al.
patent: 5519261 (1996-05-01), Stewart

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