Given the following set of events, show which routines the CPU is executing for times 0 to 100 ns. Each handler routine (with its interrupt request) takes 20 ns to complete. The priority of the interrupts ranges from IRQ6 as the highest priority interrupt to IRQ0 as the lowest priority interrupt.

Time Action

0 ns Start of main program

10 ns IRQ1

25 ns IRQ4

40 ns IRQ6

50 ns IRQ3

Time Action

0 ns: Start of Main Program

10 s: IRQ1