Question 2. (20 points [8 + 4 + 4 + 4])

(a) Describe the 6 steps that result in the execution of the Interrupt Service Routine after IRQ is asserted. Draw Stack growth wherever necessary.

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

(b) What are the 3 conditions that needs to be fulfilled for IRQ to be asserted? Explain with the help of AND gate circuit.

(c) What is the difference between JSR and SWI?

(d) What is the purpose of I flag, when it is set and when it is cleared? Explain your answer with the help of examples?