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

  • The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • More questions

    • 1. Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?

    • Options
    • A. to increase the output LOW voltage
    • B. to decrease the output LOW voltage
    • C. to increase the output HIGH voltage
    • D. to decrease the output HIGH voltage
      • Discuss
    • 2. The total sink current decreases with an increase in each load gate input.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The wave-drive sequence of a stepper motor has more torque and operates more smoothly than the full-step sequence at moderate speeds.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In order to select data input I1 of a 74151 eight-line multiplexer, the select inputs must be:

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. An RC circuit used in a 74122 retriggerable one-shot has an REXT of 100 kΩ and a CEXT of 0.005 µF. The pulse width is ________.

    • Options
    • A. 70 µs
    • B. 16 µs
    • C. 160 µs
    • D. 32 µs
      • Discuss
    • 6. When converting from decimal to binary by the repeated division-by-two method, the initial remainder becomes the MSD.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The 74S124 TTL chip is a voltage-controlled oscillator that will generate a specific frequency at Vout.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A major application for DSP is in ________ and ________ of analog signals.

    • Options
    • A. sending, receiving
    • B. digitizing, weighting
    • C. filtering, conditioning
    • D. leveling, translating
      • Discuss
    • 9. The speed-power product provides a basis for the comparison of logic circuits when power dissipation and propagation delay are important considerations in the selection of the type of logic to be used.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. An RC circuit used in a nonretriggerable 74121 one-shot has an REXT of 49 kΩ and a CEXT of 0.2 µF. The pulse width (tW) is approximately ________.

    • Options
    • A. 6.9 µs
    • B. 6.9 ms
    • C. 69 ms
    • D. 690 ms
      • Discuss

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