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Which of the following are accessible by the ISR in software interrupt mechanism?

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Which of the following are accessible by the ISR in software interrupt mechanism?

(a) register

(b) interrupt

(c) nmi

(d) memory

I got this question in an interview.

I'd like to ask this question from Sources of Interrupts topic in portion Interrupts and Exceptions of Embedded Systems

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Correct option is (a) register

Explanation: The additional data are offered by certain registers and these additional data are used to specify the type of the data parameter and the request with the specific ISR when running in the software interrupt mode.

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