Microprocessors And Microcontrollers MCQ Questions & Answers

21

A microcontroller differs from a microprocessor in terms of

A) I/O interfaces and instruction decoding B) Memory configuration and I/O interfaces C) Data bus width and clock speed D) Memory configuration and instruction decoding

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Answer & Solution

Answer: Option B

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22

Consider the following 8085 interrupts:
1. TRAP
2. INTR
3. RST 6
4. RST 7.5
5. RST 0
The software interrupt are

A) 1 and 3 only B) 2 and 5 only C) 3 and 5 only D) 1, 2, 3, 4 and 5

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Answer & Solution

Answer: Option C

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23

Match List-I with List-II and select the correct answer using the options given below the lists:

List-I (Pre terminals)	List-II (Applications)
a. SID, SOD	1. Wait state
b. Ready	2. Interrupt
c. TRAP	3. Serial data transfer
d. ALE	4. Memory of I/O read/wire
	5. Address latch control

A) a-3, b-1, c-5, d-2 B) a-3, b-1, c-2, d-5 C) a-4, b-3, c-2, d-5 D) a-4, b-3, c-1, d-2

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Answer & Solution

Answer: Option B

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24

Define the type of instruction with its addressing mode. (8086 ALP) IN AX, 04H

A) Arithmetic, indexed addressing B) Data transfer port addressing C) Logical, based indexed addressing D) Branching, register indirect addressing

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Answer & Solution

Answer: Option B

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25

Consider the following 8085 instructions:
MVI A, A9H
MVI B, 57H
ADD B
ORA A
The flag status (S, Z, CY) after the instruction ORA A is executed, is

A) (0, 1, 1) B) (0, 1, 0) C) (1, 0, 0) D) (1, 0, 1)

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Answer & Solution

Answer: Option A

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26

Consider the following:
1. Sign Flag
2. Zero Flag
3. Carry Flag
4. Parity Flag
Which of the above flags of 8085 get affected by the instruction SUB B?

A) 1 and 2 B) 1 and 3 C) 3 and 4 D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option D

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27

In a microprocessor, when a CPU is interrupted, it

A) Stops execution of instructions B) Acknowledges interrupt and branches of subroutine C) Acknowledges interrupt and continues D) Acknowledges interrupt and waits for the next instruction from the interrupting device

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Answer & Solution

Answer: Option D

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28

Consider the following statements:
The SIM instruction outputs the contents of accumulator to define:
1. Interrupt mask bit.
2. Interrupt pending bit.
3. Serial input data line.
4. Serial output data line.
Which of the statements given above are correct?

A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4

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Answer & Solution

Answer: Option D

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29

A microprocessor with 12-bit address bus will be able to access . . . . . . . . kilobytes of memory.

A) 0.4 B) 2 C) 10 D) 4

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Answer & Solution

Answer: Option D

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30

Which one of the following interrupts is both level and edge sensitive?

A) RST 7.5 B) RST 5.5 C) TRAP D) INTR

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Answer & Solution

Answer: Option C

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Microprocessors And Microcontrollers MCQ Questions & Answers | ECE