Protection circuit for program-controlled electrical equipment

Details Protection circuit for program-controlled electrical equipment Protection circuit for program-controlled electrical equipment

1998-01-07

1999-12-07

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Interrupt processing

710261, 710262, 710264, 710266, G06F 946

Patent

active

060000023

ABSTRACT:
A protection circuit for the prevention of program interruptions of electrical equipment controlled on the basis of program step clocks, by too frequent occurrences of non-maskable interrupt signals. This protection circuit comprises a controllable interrupt signal passage circuit which, depending on an output signal of a control signal source, can be controlled to a state permitting the passage of the non-maskable interrupt signal or to a state blocking said signal. The control signal source comprises a clock counter with overflow resetting function, by means of which program step clock pulses can be counted starting from a predetermined initial counting value until a predetermined overflow counting value is reached. The control signal source comprises furthermore an interrupt signal counter the counting value of which can be increased by each non-maskable interrupt event and decreased each time the overflow counting value of the clock counter is reached. The control signal source additionally comprises an evaluation logic circuit for evaluating the counts of the two counters and for issuing a control signal bringing the interrupt signal passage circuit to the blocking state thereof as long as the interrupt signal counter has a predeterminable blocking enable counting value. Finally, the control signal source comprises a status control register in which evaluation determination signals determining the evaluation behavior of the evaluation logic circuit for predetermining the overflow counting value and the blocking enable counting value as well as status signals for the status indication at least with respect to the protection circuit can be stored.

REFERENCES:
patent: 4209840 (1980-06-01), Beradi et al.
patent: 5128943 (1992-07-01), Tulpule et al.
patent: 5241680 (1993-08-01), Cole et al.
patent: 5301347 (1994-04-01), Kensky
patent: 5487181 (1996-01-01), Dailey et al.
patent: 5630090 (1997-05-01), Keehn et al.
patent: 5835750 (1998-11-01), Pan-Ratzlaff

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