Ec 334 Microcontroller Lab: Sessional Evaluation S6ece2

23 Questions | Total Attempts: 155

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Ec 334 Microcontroller Lab: Sessional Evaluation S6ece2 - Quiz

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Questions and Answers
  • 1. 
    The data bus width of 8051 is,
    • A. 

      16 bit

    • B. 

      8 bit

    • C. 

      32 bit

    • D. 

      64 bit

  • 2. 
    No. of address lines in 8051 architecture is..
    • A. 

      8 bit

    • B. 

      16 bits

    • C. 

      24 bits

    • D. 

      3o bits

  • 3. 
    Total no. of addressing modes supported by 8051 is
    • A. 

      4

    • B. 

      5

    • C. 

      6

    • D. 

      7

  • 4. 
    MOV A,@R0 Identify the addressing mode
    • A. 

      Direct addressing mode

    • B. 

      Register indirect addressing mode

    • C. 

      Immediate addressing mode

    • D. 

      Indexed addressing mode

  • 5. 
    In 8051 memmory organization, the bit addressable area is,
    • A. 

      00-15H

    • B. 

      00 - 1FH

    • C. 

      20 - 2FH

    • D. 

      30-7FH

  • 6. 
    MOV DPTR,#4500H MOVX A,@DPTR INC DPH MOVX @DPTR,A What does the above program perform?
    • A. 

      Copies the content of memmory location 4500H to 4501H

    • B. 

      Copies the content of memmory location 4500H to 4600H

    • C. 

      Copies the content of memmory location 4501H to 4500H

    • D. 

      Copies the content of memmory location 4600H to 4500H

  • 7. 
    2's complement of the number 10H
    • A. 

      20H

    • B. 

      EFH

    • C. 

      F0H

    • D. 

      E0H

  • 8. 
    Maximum size of extrenal ROM that can be addressed by 8051
    • A. 

      16KB

    • B. 

      32KB

    • C. 

      64KB

    • D. 

      128KB

  • 9. 
    8253 is
    • A. 

      Programmable timer

    • B. 

      USART

    • C. 

      Keyboard/display interface

    • D. 

      Programmable peripheral interface

  • 10. 
    Total no. of timers in 8051
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 11. 
    SFR address range in 8051
    • A. 

      00 -7FH

    • B. 

      1F-7FH

    • C. 

      80 - FFH

    • D. 

      8F - FFH

  • 12. 
    What does the following instruction perform? CPL A
    • A. 

      Compare the lower nibble of A with that of B

    • B. 

      Complement Accumulator

    • C. 

      Compare the lower nibble of A with upper nibble of A

    • D. 

      None of These

  • 13. 
    After initialisation the value in Stack Pointer registre is
    • A. 

      06H

    • B. 

      08H

    • C. 

      07H

    • D. 

      10H

  • 14. 
    Total no. of interrupt sources in 8051 including RESET is,
    • A. 

      4

    • B. 

      5

    • C. 

      6

    • D. 

      7

  • 15. 
    Which of the following is the highest priority interrupt in 8051
    • A. 

      EXTERNAL INT0(IE0)

    • B. 

      TIMER 0

    • C. 

      EXTERNAL INT1(IE1)

    • D. 

      TIMER 1

  • 16. 
    Total no. of PINs and supply voltage of 8051
    • A. 

      40 pins and 5V

    • B. 

      20 Pins and 8V

    • C. 

      40 Pins and 8V

    • D. 

      20 Pins and 5V

  • 17. 
    Parity flag in 8051 is set when,
    • A. 

      No. of 1s in Accumulator is odd

    • B. 

      No. of 1s in Accumulator is even

    • C. 

      No. of 0s in Accumulator is odd

    • D. 

      No. of 0s in Accumulator is even

  • 18. 
    Total No. of Bits in PSW register is ,
    • A. 

      4

    • B. 

      8

    • C. 

      12

    • D. 

      16

  • 19. 
    Which of the following registers is used for external data memmory access?
    • A. 

      PCON

    • B. 

      DPTR

    • C. 

      PSW

    • D. 

      TCON

  • 20. 
    Identify the addressing mode in the following instruction MOV A,40H
    • A. 

      Direct addressing mode

    • B. 

      Indirect Addressing mode

    • C. 

      Register indirect addressing mode

    • D. 

      Immediate Addressing Mode

  • 21. 
    Which of the following peripherals is used to control the flow of interrupts,
    • A. 

      8255

    • B. 

      8259

    • C. 

      8279

    • D. 

      8251

  • 22. 
    No. of address lines in 8051 architecture is..
    • A. 

      8 bit

    • B. 

      16 bits

    • C. 

      24 bits

    • D. 

      3o bits

  • 23. 
    No. of address lines in 8051 architecture is..
    • A. 

      8 bit

    • B. 

      16 bits

    • C. 

      24 bits

    • D. 

      3o bits

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