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Module 2: The 8051 Architecture

20227m

Write short notes on: Interrupts

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Short Notes: Interrupts (8051)

  • Sources 5 (INT0, T0, INT1, T1, Serial), vectors 0003-0023H, priority fixed via hardware polling but overridden by IP.
  • Enable via IE (EA global), request flags in TCON/SCON, trigger modes via ITx.
  • Response: finish instruction →push PC→vector →ISR→RETI pops.
  • Latency 3-8 cycles, nested allowed.
  • Applications: external events, timing, communication.

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