The 8051 Microcontroller - General Questions (3)

Directions to Solve

The 8051 Microcontroller - General Questions

17.

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:

No answer description available for this question

18.

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:

No answer description available for this question.

19.

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 C

Explanation:

No answer description available for this question

20.

The number of data registers is:

A.	8
B.	16
C.	32
D.	64

Answer: Option C

Explanation:

No answer description available for this question

21.

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:

No answer description available for this question

22.

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:

No answer description available for this question

23.

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:

No answer description available for this question.

24.

Data transfer from I/O to external data memory can only be done with the MOV command.

A.	True
B.	False

Answer: Option B

Explanation:

No answer description available for this question.

The 8051 Microcontroller - General Questions (3)

The 8051 Microcontroller - General Questions

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