9.4.1. Priority Levels

Try these first

1. 1.

   What is an interrupt?

   Hint

   Think about how programs manage unexpected events.

2. 2.

   Why is priority important in interrupts?

   Hint

   Consider scenarios involving emergency vs. routine tasks.

3. 3.

   What function does an interrupt vector serve?

   • It handles CPU power management
   • It directs the CPU to ISRs
   • It monitors memory usage

   Hint

   Think about how the CPU knows where to go when an interrupt is signalled.

4. 4.

   True or False: Higher-priority interrupts cannot preempt lower-priority interrupts.

   • True
   • False

   Hint

   Consider the urgency of various tasks.

5. 5.

   Design a basic interrupt handling scheme for a smart irrigation system that prioritizes water level monitoring over routine scheduling.

   Hint

   Think about how urgently the system must react to moisture levels.

6. 6.

   Assuming two ISRs are simultaneously triggered, one for user input and another for a critical warning signal, which should take precedence and why?

   Hint

   Consider the consequences of ignoring a warning signal.