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Home ‣ Digital Electronics ‣ The 8051 Microcontroller See What Others Are Saying!
  • Question

  • The 8051 can handle ________ interrupt sources.


  • Options
  • A. 3
  • B. 4
  • C. 5
  • D. 6

  • Correct Answer
  • 5 

    Explanation
    There are five interrupt sources for the 8051, which means that they can recognize 5 different events that can interrupt regular program execution. Each interrupt can be enabled or disabled by setting bits of the IE register. Likewise, the whole interrupt system can be disabled by clearing the EA bit of the same register.

    • More questions

    • 1. The solution to the BCD problem 0101 + 0100 is 00001001BCD.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The toggle condition in a master-slave J-K flip-flop means that Q and will switch to their ________ state(s) at the ________.

    • Options
    • A. opposite, active clock edge
    • B. inverted, positive clock edge
    • C. quiescent, negative clock edge
    • D. reset, synchronous clock edge
      • Discuss
    • 3. A D-type latch is able to change states and "follow" the D input regardless of the level of the ENABLE input.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Power dissipation is a measure of a circuit's noise immunity.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The final output of a POS circuit is generated by ________.

    • Options
    • A. an AND
    • B. an OR
    • C. a NOR
    • D. a NAND
      • Discuss
    • 6. A negative edge-triggered flip-flop will accept inputs only when the clock is LOW.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A type of read/write memory available with MOS technology is ________.

    • Options
    • A. SRAM
    • B. DRAM
    • C. both of the above
    • D. none of the above
      • Discuss
    • 8. Which transistor element is used in CMOS logic?

    • Options
    • A. FET
    • B. MOSFET
    • C. Bipolar
    • D. Unijunction
      • Discuss
    • 9. The four input-only pins found on devices in the MAX7000S family can be configured as specific high-speed control signals or as general user inputs.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Pull-up resistors and pull-down resistors are used to keep a floating terminal HIGH.

    • Options
    • A. True
    • B. False
      • Discuss

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