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Which exception is used in the external interrupts and decrementer-caused exceptions?

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Which exception is used in the external interrupts and decrementer-caused exceptions?

(a) synchronous precise

(b) asynchronous precise

(c) synchronous imprecise

(d) asynchronous imprecise

I got this question in semester exam.

This question is from RISC Exceptions topic in chapter Interrupts and Exceptions of Embedded Systems

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The correct choice is (b) asynchronous precise

Explanation: The asynchronous precise type exception is used to handle the external interrupts and decrementer-caused exceptions. Both these can occur at any time within the instruction flow.

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