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 4 of 13

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Q31.

If RS1=1, RS0=1, then the register bank selected is

Discuss

Answer: (d).register bank 3

Q32.

The PCON register consists of

power mode bit

power idle bit

power ideal bit

power down bit and idle bit

Discuss

Answer: (d).power down bit and idle bit

Q33.

The on-chip oscillator is stopped in

power mode

power down mode

idle mode

ideal mode

Discuss

Answer: (b).power down mode

Q34.

In idle mode, the device that is disabled is

serial port

timer block

clock to CPU

all of the mentioned

Discuss

Answer: (c).clock to CPU

Q35.

The only way to terminate the power down mode is to

CLEAR

RESET

HOLD

HLT

Discuss

Answer: (b).RESET

Q36.

The idle mode can be terminated by

PRESET

CLEAR

Interrupt

Interrupt or reset

Discuss

Answer: (d).Interrupt or reset

Q37.

Which of the following is an external interrupt?

INT0(active low)

INT2(active low)

Timer0 interrupt

Timer1 interrupt

Discuss

Answer: (a).INT0(active low)

Q38.

The interrupts, INT0(active low) and INT1(active low) are processed internally by flags

IE0 and IE1

IE0 and IF1

IF0 and IE1

IF0 and IF1

Discuss

Answer: (a).IE0 and IE1

Q39.

The flags IE0 and IE1, are automatically cleared after the control is transferred to respective vector if the interrupt is

level-sensitive

edge-sensitive

in serial port

in parallel port

Discuss

Answer: (b).edge-sensitive

Q40.

If the external interrupt sources control the flags IE0 and IE1, then the interrupt programmed is

level-sensitive

edge-sensitive

in serial port

in parallel port

Discuss

Answer: (a).level-sensitive

Page 4 of 13

Welcome to the Microcontroller 8051 MCQs Page

Microcontroller 8051 MCQs | Page 4 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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