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HARDWARE · CONCEPT PRACTICE

Interrupt priority

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2025 Autumn · Subject A · Q8

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Two nested interrupt priorities are permitted. A takes 0.5 ms and is higher priority; B takes 1.5 ms. A arrives at 1, 2.5 and 3.5 ms; B arrives at 0 and 5 ms. Find main-process CPU time in [0,5) ms, ignoring overhead.

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Source: 2025A_FE-A_Questions.pdf, PDF page 7. ID: 2025A-A-Q008. Explanation written for this textbook.

Original question · Q8
Two nested interrupt priorities are permitted. A takes 0.5 ms and is higher priority; B takes 1.5 ms. A arrives at 1, 2.5 and 3.5 ms; B arrives at 0 and 5 ms. Find main-process CPU time in [0,5) ms, ignoring overhead.

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