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The 8051 Microcontroller problems

1. The 8051 has ________ 16-bit counter/timers.
Options
A. 1
B. 2
C. 3
D. 4

Correct Answer: 2

2. The total external data memory that can be interfaced to the 8051 is:
Options
A. 32K
B. 64K
C. 128K
D. 256K

Correct Answer: 64K

3. What is the difference between the 8031 and the 8051?
Options
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.

Correct Answer: The 8031 is ROM-less.

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

Correct Answer: MOV R2, P3

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

Also asked in:

Correct Answer: 32

6. The following program will receive data from port 1, determine whether bit 2 is high, and then send the number FFH to port 3:
READ: MOV A,P1
ANL A,#2H
CJNE A,#02H,READ
MOV P3,#FFH
Options
A. True
B. False

Correct Answer: True

7. The contents of the accumulator after this operation
MOV A,#0BH
ANL A,#2CH
will be
Options
A. 11010111
B. 11011010
C. 00001000
D. 00101000

Correct Answer: 00001000

8. The last 96 locations in the internal data memory are reserved for general-purpose data storage and stack.
Options
A. True
B. False

Correct Answer: False

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

Correct Answer: 2B H

10. The microcontroller is useful in systems that have nonvariable programs for dedicated applications.
Options
A. True
B. False

Correct Answer: True

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