Multivibrators and 555 Timer - General Questions (3)

Directions to Solve

Multivibrators and 555 Timer - General Questions

17. 

The I/O port that does not have a dual-purpose role is:
A. port 0
B. port 1
C. port 2
D. port 3

Answer: Option B

Explanation:

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18. 

What is the difference between the 8031 and the 8051?
A. The 8031 has no interrupts.
B. The 8031 is ROM-less.
C. The 8051 is ROM-less.
D. The 8051 has 64 bytes more memory.

Answer: Option B

Explanation:

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19. 

The designs of a centigrade thermometer and a PWM speed-control circuit can be implemented by the 8051.
A. True
B. False

Answer: Option A

Explanation:

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20. 

When the 8051 is reset and the EA line is LOW, the program counter points to the first program instruction in the:
A. internal code memory
B. external code memory
C. internal data memory
D. external data memory

Answer: Option B

Explanation:

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21. 

The number of data registers is:
A. 8
B. 16
C. 32
D. 64

Answer: Option C

Explanation:

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22. 

Which of the following commands will move the value at port 3 to register 2?
A. MOV P2, R3
B. MOV R3, P2
C. MOV 3P, R2
D. MOV R2, P3

Answer: Option D

Explanation:

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23. 

This program code will read data from port 0 and write it to port 2, and it will stop looping when bit 3 of port 2 is set:

STAT: MOV A, PO
  MOV P2,A
  JNB P2.3, STAT
A. True
B. False

Answer: Option A

Explanation:

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24. 

Which of the following commands will move the number 27H into the accumulator?
A. MOV A, P27
B. MOV A, #27H
C. MOV A, 27H
D. MOV A, @27

Answer: Option B

Explanation:

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