8085 Architecture Questions

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1.

 8085 microprocessor is an 8-bit microprocessor designed by?

A

IBM

B

Dell

C

Intel

D

VAX

Correct Answer: C

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2.

 In 8085, 16-bit address bus, which can address upto?

A

16KB

B

32KB

C

64KB

D

128KB

Correct Answer: C

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3.

There are _______ general purpose registers in 8085 processor

A

5

B

6

C

7

D

8

Correct Answer: A

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4.

Flag register is an 8-bit register having __________ 1-bit flip-flops.

A

3

B

4

C

5

D

6

Correct Answer: C

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5.

What is true about Program counter?

A

It is an 8-bit register, which holds the temporary data of arithmetic and logical operations.

B

When an instruction is fetched from memory then it is stored in the program counter

C

It provides timing and control signal to the microprocessor

D

It is a 16-bit register used to store the memory address location of the next instruction to be executed.

Correct Answer: D

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6.

This signal indicates that another master is requesting the use of the address and data buses.

A

READY

B

HOLD

C

HLDA

D

INTA

Correct Answer: B

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7.

This signal is used as the system clock for devices connected with the microprocessor.

A

X1, X2

B

CLK OUT

C

CLK IN

D

IO/M

Correct Answer: B

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8.

 Which of the following is true about Control and status signals?

A

These signals are used to identify the nature of operation.

B

There are 3 control signal and 3 status signals.

C

Three status signals are IO/M, S0 & S1.

D

All of the above

Correct Answer: D

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9.

MVI K, 20F is an example of?

A

Immediate addressing mode

B

Register addressing mode

C

Direct addressing mode

D

Indirect addressing mode

Correct Answer: A

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10.

The clock frequency of an 8085 microprocessor is 5 MHz. If the time required to execute an instruction is 1.4 ?s, then the number of T-states needed for executing the instruction is

A

1

B

6

C

7

D

4

Correct Answer: C

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