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Welcome to the 8051 Microcontroller MCQs Page

Dive deep into the fascinating world of 8051 Microcontroller with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8051 Microcontroller, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8051 Microcontroller, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8051 Microcontroller. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8051 Microcontroller. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8051 Microcontroller MCQs | Page 4 of 14

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Q31.
When we add two numbers the destination address must always be.

a.

some immediate data

b.

any register

c.

accumulator

d.

memory

Discuss
Answer: (c).accumulator
Q32.
DAA command adds 6 to the nibble if:

a.

CY and AC are necessarily 1

b.

either CY or AC is 1

c.

no relation with CY or AC

d.

CY is 1

Discuss
Answer: (b).either CY or AC is 1
Q33.
If SUBB A,R4 is executed, then actually what operation is being applied?

a.

R4+A

b.

R4-A

c.

A-R4

d.

R4+A

Discuss
Answer: (c).A-R4
Q34.
A valid division instruction always makes:

a.

CY=0,AC=1

b.

CY=1,AC=1

c.

CY=0,AC=0

d.

no relation with AC and CY

Discuss
Answer: (c).CY=0,AC=0
Q35.
In 8 bit signed number operations, OV flag is set to 1 if:

a.

a carry is generated from D7 bit

b.

a carry is generated from D3 bit

c.

a carry is generated from D7 or D3 bit

d.

a carry is generated from D7 or D6 bit

Discuss
Answer: (d).a carry is generated from D7 or D6 bit
Q36.
In unsigned number addition, status of which bit is important?

a.

OV

b.

CY

c.

AC

d.

PSW

Discuss
Answer: (b).CY
Q37.
Which instructions have no affect on the flags of PSW?

a.

ANL

b.

ORL

c.

XRL

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q38.
ANL instruction is used

a.

to AND the contents of the two registers

b.

to mask the status of the bits

c.

all of the mentioned

d.

none of the mentioned

Discuss
Answer: (c).all of the mentioned
Q39.
CJNE instruction makes

a.

the pointer to jump if the values of the destination and the source address are equal

b.

sets CY=1, if the contents of destination register is greater then that of the source register

c.

sets CY=0, if the contents of destination register is smaller then that of the source register

d.

none of the mentioned

Discuss
Answer: (d).none of the mentioned
Q40.
XRL, ORL, ANL commands have

a.

accumulator as the destination address and any register, memory or any immediate data as the source address

b.

accumulator as the destination address and any immediate data as the source address

c.

any register as the destination address and accumulator, memory or any immediate data as the source address

d.

any register as the destination address and any immediate data as the source address

Discuss
Answer: (a).accumulator as the destination address and any register, memory or any immediate data as the source address
Page 4 of 14

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