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Interrupt and Stack of 8051 MCQs

  • 1. Which of the following is an external interrupt?
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    Answer is : A
  • 2. The interrupts, INT0(active low) and INT1(active low) are processed internally by flags
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    Answer is : A
  • 3. The flags IE0 and IE1, are automatically cleared after the control is transferred to respective vector if the interrupt is
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    Answer is : B
  • 4. If the external interrupt sources control the flags IE0 and IE1, then the interrupt programmed is
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    Answer is : A
  • 5. The pulses at T0 or T1 pin are counted in
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    Answer is : B
  • 6. In timer mode, the oscillator clock is divided by a prescalar
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    Answer is : D
  • 7. The serial port interrupt is generated if
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    Answer is : C
  • 8. In serial port interrupt, after the control is transferred to the interrupt service routine, the flag that is cleared is
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    Answer is : D
  • 9. The atleast number of machine cycles for which the external interrupts that are programmed level-sensitive should remain high is
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    Answer is : B
  • 10. If the external interrupts are programmed edge sensitive, then they should remain high for atleast
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    Answer is : C
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