Microprocessors and Microcontrollers (3160914) MCQs

MCQs of 8051 Microcontroller Architecture

Showing 81 to 89 out of 89 Questions
6 7 8 9
81.

The register that is used for accessing external data memory is

(a)

DPH
(b)

DPL
(c)

DPTR
(d)

NONE
Answer:

Option (c)

82.

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
Answer:

Option (a)

83.

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

(a)

2
(b)

4
(c)

6
(d)

8
Answer:

Option (d)

84.

The PCON register consists of

(a)

power mode bit
(b)

power idle bit
(c)

power ideal bit
(d)

power down bit and idle bit
Answer:

Option (d)

85.

The on-chip oscillator is stopped in

(a)

power mode
(b)

power down mode
(c)

idle mode
(d)

ideal mode
Answer:

Option (b)

86.

In idle mode, the device that is disabled is

(a)

serial port
(b)

timer block
(c)

clock to CPU
(d)

all of the mentioned
Answer:

Option (c)

87.

The only way to terminate the power down mode is to

(a)

CLEAR
(b)

RESET
(c)

HOLD
(d)

HLT
Answer:

Option (b)

88.

The idle mode can be terminated by

(a)

PRESET
(b)

CLEAR
(c)

Interrupt
(d)

Interrupt or reset
Answer:

Option (d)

89.

The addressing mode, in which the instructions has no source and destination operands is

(a)

register instructions
(b)

register specific instructions
(c)

direct addressing
(d)

indirect addressing
Answer:

Option (b)

Showing 81 to 89 out of 89 Questions
6 7 8 9