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Which of the following is connected to a fault detection circuit?

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Which of the following is connected to a fault detection circuit?

(a) internal interrupt

(b) external interrupt

(c) NMI

(d) software interrupt

This question was addressed to me in class test.

I want to ask this question from Fast Interrupts in portion Interrupts and Exceptions of Embedded Systems

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Correct choice is (c) NMI

The best I can explain: The non-maskable interrupt is used to generate an interrupt which can be connected to a fault detection circuit like watchdog timer or parity checker.

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