Apparatus for detecting abnormalitey of clock in microcomputer u

Details Apparatus for detecting abnormalitey of clock in microcomputer u Apparatus for detecting abnormalitey of clock in microcomputer u

1997-05-08

1999-09-21

Chin, Gary

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

701 1, 377 39, G06F 1100

Patent

active

059547723

ABSTRACT:
An apparatus for detecting the abnormality of a clock in a microcomputer used for a motor vehicle includes a reference clock generator for generating a reference clock signal required for operation of the microcomputer, a pulse signal generator for generating a pulse signal of a constant period based on an instruction signal from the microcomputer, a comparator for comparing the pulse signal from the pulse signal generator and the reference clock signal from the reference clock generator and producing a comparison signal based on the result of comparison, and a determining circuit for determining, based on the comparison signal from the comparator, whether or not the reference clock signal is normal. An indicator is enabled only when the reference clock signal is in the abnormal state. The abnormality of the reference clock can be detected without requiring a separate oscillator used for generating an additional clock signal for comparison with the reference clock signal.

REFERENCES:
patent: 4304003 (1981-12-01), Kakizawa et al.
patent: 4541050 (1985-09-01), Honda et al.
patent: 4597052 (1986-06-01), Matsuda
patent: 5657361 (1997-08-01), Inagaki et al.
patent: 5677838 (1997-10-01), Itou et al.

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