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The 8051 Microcontroller problems

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

Discuss

Correct Answer: True

2. Bit-addressable memory locations are:
Options
A. 10H through 1FH
B. 20H through 2FH
C. 30H through 3FH
D. 40H through 4FH

Discuss

Correct Answer: 20H through 2FH

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

Discuss

Correct Answer: True

4. Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.
Options
A. True
B. False

Discuss

Correct Answer: True

5. This statement will set the address of the bit to 1 (8051 Micro-controller):
SETB 01H
Options
A. True
B. False

Discuss

Correct Answer: False

6. 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
Options
A. True
B. False

Discuss

Correct Answer: True

7. The 8051 can handle ________ interrupt sources.
Options
A. 3
B. 4
C. 5
D. 6

Discuss

Correct Answer: 5

Explanation:

There are five interrupt sources for the 8051, which means that they can recognize 5 different events that can interrupt regular program execution. Each interrupt can be enabled or disabled by setting bits of the IE register. Likewise, the whole interrupt system can be disabled by clearing the EA bit of the same register.

8. The 8-bit address bus allows access to an address range of:
Options
A. 0000 to FFFFH
B. 000 to FFFH
C. 00 to FFH
D. 0 to FH

Discuss

Correct Answer: 00 to FFH

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

Discuss

Correct Answer: MOV A, 04H

10. The following command will rotate the 8 bits of the accumulator one position to the left:
RL A
Options
A. True
B. False

Discuss

Correct Answer: True

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STAT:	MOV A, PO
	MOV P2,A
	JNB P2.3, STAT

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The 8051 Microcontroller problems

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