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.

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 7 of 13

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Q61.

The only memory which can be accessed using indexed addressing mode is

RAM

ROM

Main memory

Program memory

Discuss

Answer: (d).Program memory

Q62.

The data address of look-up table is found by adding the contents of

accumulator with that of program counter

accumulator with that of program counter or data pointer

data register with that of program counter or accumulator

data register with that of program counter or data pointer

Discuss

Answer: (b).accumulator with that of program counter or data pointer

Q63.

Which of the following is not an instruction of 8051 instructions?

arithmetic instructions

boolean instructions

logical instructions

All are instructions of 8051

Discuss

Answer: (d).All are instructions of 8051

Q64.

The logical instruction that affects the carry flag during its execution is

XRL A;

ANL A;

ORL A;

RLC A;

Discuss

Answer: (d).RLC A;

Q65.

In logical instructions, the immediate data can be an operand for

increment operation

decrement operation

single operand instruction

none of the mentioned

Discuss

Answer: (d).none of the mentioned

Q66.

If the most significant bit of relative address byte is 1, then the short jump instruction is

forward jump

back jump

either forward or back jump

none of the mentioned

Discuss

Answer: (b).back jump

Q67.

The first byte of an absolute jump instruction consists of

3 LSBs of opcode and 5 MSBs of 11-bit address

5 MSBs of opcode and 3 LSBs of 11-bit address

6 MSBs of opcode and 1 LSB of 11-bit address

5 LSBs of opcode and 3 MSBs of 11-bit address

Discuss

Answer: (d).5 LSBs of opcode and 3 MSBs of 11-bit address

Q68.

The third byte of the long jump instruction is

opcode

5 LSBs of opcode

higher byte of jump location or subroutine

lower byte of jump location or subroutine

Discuss

Answer: (c).higher byte of jump location or subroutine

Q69.

The absolute jump instruction is intended mainly for a jump within a memory space of

2 bytes

2 Kbytes

2 Mbytes

none of the mentioned

Discuss

Answer: (b).2 Kbytes

Q70.

The LJMP instruction is very useful in programming in the external code memory space of

32 MB

64 MB

32 KB

64 KB

Discuss

Answer: (d).64 KB

Page 7 of 13

Welcome to the Microcontroller 8051 MCQs Page

Microcontroller 8051 MCQs | Page 7 of 13

Explore more Topics under Microprocessor

Microprocessor Basics

Microprocessor Components

8086 Instruction Set

DMA

80286 80287 Microprocessor

Microprocessor Architecture

Pentium 4 processor

RISC Architecture

Intel 8085 Microprocessor

Special Architectural Features and Programming

Peripherals and Interfacing with 8086

Multimicroprocessor Systems

80386 and 80486 Microprocessor

Recent Advancements in Microprocessor Architecture

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