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Which of the following can auto increment the register R1?

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Which of the following can auto increment the register R1?

(a) SCI timer

(b) interrupt

(c) software interrupt

(d) non-maskable interrupt

This question was posed to me in homework.

This is a very interesting question from Fast Interrupts topic in chapter Interrupts and Exceptions of Embedded Systems

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Correct answer is (a) SCI timer

For explanation: The SCI timer is used to generate the two instruction fast interrupt that can increment the register R1 which acts as a simple counter.

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