Method and apparatus for diagnosing CPU for CPU-runaway-preventi

Details Method and apparatus for diagnosing CPU for CPU-runaway-preventi Method and apparatus for diagnosing CPU for CPU-runaway-preventi

1992-12-30

1995-04-18

Kriess, Kevin A.

Boots, shoes, and leggings

3642641, 364265, 3642645, 364DIG1, G06F 1100

Patent

active

054086485

ABSTRACT:
A method and apparatus for preventing runaway of CPU using a battery voltage as a power source voltage, in which the operation of CPU and the power source voltage of the CPU are inspected at the abnormal operation of the CPU and/or at the abnormal reduction of the power source voltage of CPU, system resetting is effected on the CPU, system reset signals for the CPU are counted. When the number of system reset signals for a predetermined time satisfies predetermined conditions, it is judged that the CPU is in failure. When the abnormal reduction of the power source voltage of the CPU is detected, the counting of system reset signals is prohibited.

REFERENCES:
patent: 4683859 (1987-08-01), Tamura et al.
patent: 4775957 (1988-10-01), Yakuwa et al.
patent: 4903193 (1990-02-01), Nakamura
patent: 4945335 (1990-07-01), Kimura et al.
patent: 5212797 (1993-03-01), Miyake et al.

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