Interrupts

• Allow parallel tasking

  • Interrupt routine runs in “background”

• Allow fast, low-overhead interaction with environment

  • Don’t have to poll
  • Immediate reaction

• An automatic function call

  • Easy to program

• 8051 Interrupts

  • Serial port - wake up when data arrives/data has left
  • Timer 0 overflow
  • Timer 1 overflow
  • External interrupt 0
  • External interrupt 1

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