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Welcome to the Microcontroller 8051 MCQs Page

Dive deep into the fascinating world of Microcontroller 8051 with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Microcontroller 8051, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of Microcontroller 8051, 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 Microprocessor.

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

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

Microcontroller 8051 MCQs | Page 6 of 13

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Q51.
All the interrupts are enabled using a special function register called

a.

interrupt priority register

b.

interrupt register

c.

interrupt function register

d.

interrupt enable register

Discuss
Answer: (d).interrupt enable register
Q52.
The number of bytes stored on the stack during one operation of PUSH or POP is

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (a).1
Q53.
The step involved in PUSH operation is

a.

increment stack by 2 and store 8-bit content to address pointed to by SP

b.

decrement stack by 1 and store 16-bit content to address pointed to by SP

c.

increment stack by 1 and store 8-bit content to address pointed to by SP

d.

store 8-bit content to address pointed to by SP and then increment stack by 1

Discuss
Answer: (c).increment stack by 1 and store 8-bit content to address pointed to by SP
Q54.
The step involved in POP operation is

a.

decrement stack by 2 and store 8-bit content to address pointed to by SP

b.

store 16-bit content to address pointed to by SP and decrement stack by 1

c.

decrement stack by 1 and store content of top of stack to address pointed to by SP

d.

store content of top of stack to address pointed to by SP and then decrement stack by 1

Discuss
Answer: (d).store content of top of stack to address pointed to by SP and then decrement stack by 1
Q55.
The 8051 stack is

a.

auto-decrement during PUSH operations

b.

auto-increment during POP operations

c.

auto-decrement during POP operations

d.

auto-increment during PUSH operations

Discuss
Answer: (d).auto-increment during PUSH operations
Q56.
After reset, the stack pointer(SP) is initialized to the address of

a.

internal ROM

b.

internal RAM

c.

external ROM

d.

external RAM

Discuss
Answer: (b).internal RAM
Q57.
The address register for storing the 8-bit addresses can be

a.

R0 of the selected bank of register

b.

R1 of the selected bank of register

c.

Stack pointer

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q58.
The instruction, ADD A, R7 is an example of

a.

register instructions

b.

register specific instructions

c.

indexed addressing

d.

none of the mentioned

Discuss
Answer: (a).register instructions
Q59.
The instruction, ADD A, #100 performs

a.

100(decimal) is added to contents of address register

b.

100(decimal) is subtracted from the accumulator

c.

100(decimal) is added to contents of an accumulator

d.

none of the mentioned

Discuss
Answer: (c).100(decimal) is added to contents of an accumulator
Q60.
In which of these addressing modes, a constant is specified in the instruction, after the opcode byte?

a.

register instructions

b.

register specific instructions

c.

direct addressing

d.

immediate mode

Discuss
Answer: (d).immediate mode
Page 6 of 13

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