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Module 2: The 8051 Architecture

20207m

Explain the various external interrupt signals in 8051.

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External Interrupt Signals in 8051

  • \overline{INT0} (P3.2) & \overline{INT1} (P3.3): Active-low inputs. Trigger mode selectable via IT0/IT1 in TCON: ITx=0 level-triggered (low holds interrupt), ITx=1 edge-triggered (falling edge). Flags IE0/IE1 set; auto-cleared for edge after ISR.
  • Vector addresses: INT0=0003H, INT1=0013H.
  • Enable: EX0/EX1 in IE, global EA.
  • Priority: PX0/PX1 in IP.
  • Usage: Connect external device with pull-up, drive low pulse >1 machine cycle for edge; hold low until serviced for level.

Also serial and timer interrupts are internal but often listed.

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