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Module 2: The 8051 Architecture

20232m

The number of hardware interrupts in 8051 is?
(i) 2
(ii) 3
(iii) 4
(iv) 5

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Answer: (iv) 5

Explanation: 8051 has 5 interrupt sources (interrupt vector addresses):

  1. INT0 (0003H) external
  2. Timer 0 overflow TF0 (000BH)
  3. INT1 (0013H) external
  4. Timer 1 overflow TF1 (001BH)
  5. Serial RI+TI (0023H)
    Some derivatives add extra, but classic 8051 has 5; 2 are external hardware interrupts.

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