Multivibrators and 555 Timer - General Questions (2)

Directions to Solve

Multivibrators and 555 Timer - General Questions

9. 

Which of the following commands will copy the contents of location 4H to the accumulator?
A. MOV A, 04H
B. MOV A, L4
C. MOV L4, A
D. MOV 04H, A

Answer: Option A

Explanation:

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10. 

The statement LCALL READ passes control to the line labelled READ.
A. True
B. False

Answer: Option A

Explanation:

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11. 

Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1?
A. MOV @ P1, R0
B. MOV @ R0, P1
C. MOV P1, @ R0
D. MOV P1, R0

Answer: Option C

Explanation:

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12. 

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

LOOP: MOV A, #00H
  JNZ LOOP
A. True
B. False

Answer: Option B

Explanation:

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13. 

The contents of the accumulator after this operation
MOV A,#2BH
ORL A,00H
will be:
A. 1B H
B. 2B H
C. 3B H
D. 4B H

Answer: Option B

Explanation:

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14. 

The special function registers can be referred to by their hex addresses or by their register names.
A. True
B. False

Answer: Option A

Explanation:

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15. 

The following command will copy the accumulator to the location whose address is 23H:
MOV 23H,A
A. True
B. False

Answer: Option A

Explanation:

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16. 

To interface external EPROM memory for applications, it is necessary to demultiplex the address/data lines of the 8051.
A. True
B. False

Answer: Option A

Explanation:

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