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Execution sequence of main program and interrupts on CPU

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Given the following sequence of events, show which routines the CPU is executing from time 0 to 100ns. Each handler routine with its interrupt request takes 20 ns to complete.

Time Action
0 ns Start of main program
10ns IRQ4
20ns IRQ6
45ns IRQ1
60ns IRQ3.

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Solution Summary

CPU timeline explained in solution assumes that lower interrupts can be interrupted by higher interrupts.

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Following explanation of cpu timeline assumes that lower interrupts can be interrupted by higher interrupts.

0-10 ns: Main program executes, IRQ4 comes at 10ns and interrupts Main program.
10-20 ns: IRQ4 handler executes, IRQ6 comes at ...

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