8085 Architecture Questions

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11.

The main purpose of Accumulator register of 8085 is

A

temporary data storage

B

selection of peripheral

C

storing instructions

D

used as primary pointer

Correct Answer: A

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12.

In 8085 microprocessors, which signal is used to insert wait?

A

READY

B

ALE

C

HOLD

D

INTR

Correct Answer: A

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13.

The ALU of a microprocessor performs operations of 8-bit two

A

Result = D8H, Overflow and negative flags set

B

Result = D8H, Negative flag is set

C

Result = D8H, No flags set

D

Result = 28H, Overflow flag set

Correct Answer: B

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14.

The highest priority interrupt in 8085 is:

A

TRAP

B

RST6.5

C

INTR

D

RST7.5

Correct Answer: A

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15.

The program counter (PC) in a micro-processor:

A

counts the number of programs being executed by the microprocessor

B

counts the number of instructions being executed by the microprocessor

C

counts the number of interrupts handled by the microprocessor

D

keeps the address of the next instruction to be fetched

Correct Answer: D

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16.

Which stack is used in 8085 microprocessors?

A

FIFO

B

LILO

C

LIFO

D

None of the above

Correct Answer: C

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17.

The status flag that is available in microprocessor 8085, but not available in micro-controller 8051 is:

A

Carry flag

B

Overflow flag

C

Auxiliary flag

D

Zero flag

Correct Answer: D

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18.

A bus connected between the CPU and the main memory that permits transfer of information between main memory and the CPU is known as

A

DMA bus

B

Memory bus

C

Address bus

D

Control bus

Correct Answer: B

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19.

Register of microprocessor (?P) which keeps track of the execution of program and which contain the memory address of next instruction to be executed is called

A

Index register

B

Program counter

C

Memory address register

D

Instruction register

Correct Answer: B

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20.

When a program is being executed in an 8085 microprocessor, its program counter contains

A

The memory address as the instruction that is to be executed next

B

The memory address of the instruction that is being currently matched

C

The total number of instructions in the program being executed

D

The number of instructions in the current program that have already been executed

Correct Answer: A

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