Register Set of 8051 Questions

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11.

The on-chip oscillator is stopped in

A

power mode

B

power down mode

C

idle mode

D

ideal mode

Correct Answer: B

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12.

In idle mode, the device that is disabled is

A

serial port

B

timer block

C

clock to CPU

D

all of the mentioned

Correct Answer: C

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13.

The only way to terminate the power down mode is to

A

CLEAR

B

RESET

C

HOLD

D

HLT

Correct Answer: B

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14.

The idle mode can be terminated by

A

PRESET

B

CLEAR

C

Interrupt

D

Interrupt or reset

Correct Answer: D

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15.

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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16.

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

A

P1

B

SCON

C

TMOD

D

TCON

Correct Answer: C

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17.

Which of the following is bit-addressable register?

A

SBUF

B

PCON

C

TMOD

D

SCON

Correct Answer: D

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18.

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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19.

The register that is used for accessing external data memory is

A

DPH

B

DPL

C

DPTR

D

NONE

Correct Answer: C

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20.

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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