1.2.1.3 Interrupts

Question 1

What is an Interrupt?

Answer 1

• A signal from hardware, software or the clock to alert the CPU.

-If the interrupt is a higher priority than the current task, the current routine pauses and resumes after the interrupt is executed.

Question 2

What is an ISR?

Answer 2

• Interrupt Service Routine
• If an interrupt is a higher priority than the current task, register contents are temporarily transferred onto the system stack at the end of the current FDE cycle and the interrupt is handled.