Solution

The correct answer is C, A, B, D, E.

Key Points

• Step C: The interrupted instruction is executed completely to ensure system stability and prevent partial execution.
• Step A: The program counter (PC) and status register are saved to preserve the current state of the system.
• Step B: The interrupt vector is fetched from memory to identify the appropriate interrupt service routine (ISR).
• Step D: Control is transferred to the ISR to handle the interrupt.
• Step E: The program counter (PC) and registers are restored after the ISR is executed, allowing the system to return to normal operation.

Additional Information

• Interrupt Handling Process:
  • Interrupts are crucial for handling asynchronous events in computing systems.
  • The sequence ensures minimal disruption and proper handling of interrupts.
• Importance of Saving PC and Registers:
  • Preserving the PC and registers ensures that the current state is not lost during the interrupt.
  • This allows the system to resume smoothly after the ISR is executed.
• Role of Interrupt Vector:
  • The interrupt vector points to the memory location of the ISR.
  • Fetching it is a critical step in identifying the appropriate response to the interrupt.
• Execution of ISR:
  • The ISR handles the specific interrupt request, ensuring the system responds correctly.
  • Once completed, the system state is restored for normal operation.