Flow chart of interrupt process

(1). Interrupt request

• Internal interrupt and external interrupt
• Hardware interrupt software interrupt
• Unshielded interrupt and maskable interrupt

(2). Interrupt optimization

(3). Interrupt response

(4). Interrupt processing

• Interrupt implicit instruction
  • Close the interrupt
  • Save breakpoints
  • Bring out interrupt service program
• interrupt ( Handle ) Program
  • Save site and screen words
  • Interrupt service routine
    • Open the interrupt
    • Execute interrupt service procedure
    • Close the interrupt
  • Restore the scene and shield words
  • Open the interrupt
  • Interrupt return