Microprocessor fault-monitoring circuit

Details Microprocessor fault-monitoring circuit Microprocessor fault-monitoring circuit

1983-02-25

1986-04-29

Thomas, James D.

Excavating

371 62, 371 12, 377 28, 364900, G06F 1100

Patent

active

045861803

ABSTRACT:
A circuit is disclosed for fault-monitoring a microprocessor. The circuit includes an oscillator having an output signal of the same frequency as a test signal output of the microprocessor. The circuit also includes a binary counter. The microprocessor test output is coupled to the reset input of the counter and the oscillator is coupled to the counting input of the counter. The counter counts when the test signal does not correspond in frequency to the oscillator signal. A lower order output signal of the counter is used as a reset for the microprocessor and a higher order output of the counter is used to generate a fault indicating signal if the microprocessor has not resumed correct operation and to inhibit the microprocessor. The oscillator is coupled to the counting input of the counter through a logic circuit. The two outputs of the counter are coupled to another logic circuit which supplies the reset and inhibit signals to the microprocessor. A fault indicator is also coupled to the higher order output of the counter. The invention is advantageous in that only a small amount of circuitry is required to provide the monitoring functions disclosed herein.

REFERENCES:
patent: 3566368 (1971-02-01), De Blauw
patent: 3749897 (1973-07-01), Hirvela
patent: 3795800 (1974-03-01), Nimmo
patent: 4072852 (1978-02-01), Hogan et al.
patent: 4321666 (1982-03-01), Tasar et al.
patent: 4405892 (1983-10-01), Ruhnau et al.
SIEMENS TELEPERM C Computer Module M74005-A8810, 2 pages.

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