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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • MOV A, @ R1 will:


  • Options
  • A. copy R1 to the accumulator
  • B. copy the accumulator to R1
  • C. copy the contents of memory whose address is in R1 to the accumulator
  • D. copy the accumulator to the contents of memory whose address is in R1

  • Correct Answer
  • copy the contents of memory whose address is in R1 to the accumulator 

    • The 8051 Microcontroller problems

    Search Results

    • 1. The following program will cause the 8051 to be stuck in a loop:

      LOOP: MOV A, #00H
        JNZ LOOP

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. This program code will be executed once:

      STAT: MOV A, #01H
        JNZ STAT

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A 0.3-µF capacitor has an initial charge of 2.7 V. If it is discharged through a 10-kΩ resistor for 6.5 ms, how much voltage will be left across the capacitor?

    • Options
    • A. 0.0 V
    • B. 0.309 V
    • C. 2.7 V
    • D. 2.295 V
      • Discuss
    • 4. What is another name for a bistable multivibrator?

    • Options
    • A. an on-off switch
    • B. an oscillator
    • C. a flip-flop
      • Discuss
    • 5. The pulse width out of a one-shot multivibrator increases when the:

    • Options
    • A. supply voltage increases
    • B. timing resistor decreases
    • C. UTP decreases
    • D. timing capacitance increases
      • Discuss
    • 6. Data transfer from I/O to external data memory can only be done with the MOV command.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The total amount of external code memory that can be interfaced to the 8051 is:

    • Options
    • A. 32K
    • B. 64K
    • C. 128K
    • D. 256K
      • Discuss
    • 8. The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. When the 8051 is reset and the line is HIGH, the program counter points to the first program instruction in the:

    • Options
    • A. internal code memory
    • B. external code memory
    • C. internal data memory
    • D. external data memory
      • Discuss
    • 10. Both registers TL0 and TL1 are needed to start Timer 0.

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

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