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Which of the following forces a standard service routine?

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Which of the following forces a standard service routine?

(a) READY interrupt

(b) IRQA interrupt

(c) NMI

(d) software interrupt

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Query is from Fast Interrupts topic in chapter Interrupts and Exceptions of Embedded Systems

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The correct answer is (b) IRQA interrupt

Easy explanation: The SCI timer is used to generate the two instruction fast interrupt which increments the register R1 that acts as a simple counter which times the period between the events. The events itself generates an IRQA interrupt, that forces the service routine.

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