Register Set of 8051 Questions

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1.

Which of the following is an 8-bit register?

A

PSW(Program Status Word)

B

TCON(Timer Control Register)

C

Accumulator

D

All of the mentioned

Correct Answer: D

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2.

Which of the following register can be addressed as a byte?

A

P1

B

SCON

C

TMOD

D

TMOD

Correct Answer: C

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3.

Which of the following is bit-addressable register?

A

SBUF

B

PCON

C

TMOD

D

SCON

Correct Answer: D

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4.

The higher and lower bytes of a 16-bit register DPTR are represented respectively as

A

LDPTR and HDPTR

B

DPTRL and DPTRH

C

DPH and DPL

D

HDP and LDP

Correct Answer: C

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5.

The register that is used for accessing external data memory is

A

DPHDPL

B

DPL

C

DPTR

D

NONE

Correct Answer: C

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6.

Among the four groups of register banks, the number of groups that can be accessed at a time is

A

1

B

2

C

3

D

all the four

Correct Answer: A

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7.

The number of 8-bit registers that a register bank contain is

A

2

B

4

C

6

D

8

Correct Answer: D

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8.

If RS1=1, RS0=0, then the register bank selected is

A

register bank 0

B

register bank 1

C

register bank 2

D

register bank 3

Correct Answer: C

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9.

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

A

register bank 0

B

register bank 1

C

register bank 2

D

register bank 3

Correct Answer: D

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10.

The PCON register consists of

A

power mode bit

B

power idle bit

C

power ideal bit

D

power down bit and idle bit

Correct Answer: D

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