Watchdog timer for microcontroller

Details Watchdog timer for microcontroller Watchdog timer for microcontroller

2005-11-01

2005-11-01

Iqbal, Nadeem (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S055000

Reexamination Certificate

active

06961866

ABSTRACT:
A method for operating a watchdog timer associated with a microcontroller that generates refresh commands for the watchdog timer is provided. The refresh commands are separated by a time interval within a predetermined range. The method includes receiving the refresh commands by the watchdog timer, and generating a microcontroller reset command by the watchdog timer when a time interval separating successively received refresh commands is not within the predetermined range. In particular, the generating includes staring a refresh countdown on each receipt of a refresh command by the watchdog timer. A reset countdown is started if the refresh countdown has timed out, and if the refresh countdown has not timed out when a next refresh command is received, then the next refresh command does not restart the reset countdown. The microcontroller reset command is generated if the reset countdown has timed out.

REFERENCES:
patent: 4705970 (1987-11-01), Turnpaugh
patent: 5175845 (1992-12-01), Little
patent: 5203000 (1993-04-01), Folkes et al.
patent: 5418968 (1995-05-01), Gobeli
patent: 5694336 (1997-12-01), Hirao
patent: 5864663 (1999-01-01), Stolan
patent: 5907863 (1999-05-01), Bolyn
patent: 0315054 (1989-05-01), None

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