Microprocessors and Microcontrollers (3160914) MCQs

MCQs of 8051 Microcontroller Architecture

Showing 21 to 30 out of 89 Questions
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21.

In unsigned number addition, the status of which bit is important?

(a)

OV
(b)

CY
(c)

AC
(d)

PSW
Answer:

Option (b)

22.

Which instructions have no effect on the flags of PSW?

(a)

ANL
(b)

ORL
(c)

XRL
(d)

ALL OF THE MENTIONED
Answer:

Option (d)

23.

8051 has on cheap ROM size of 

(a)

4k bytes
(b)

8k bytes
(c)

16k bytes 
(d)

32k bytes
Answer:

Option (a)

24.

8051 has RAM size of 

(a)

256 bytes
(b)

64 bytes
(c)

128bytes
(d)

8 bytes
Answer:

Option (c)

25.

8051 has ........... no. of timers

(a)

1
(b)

2
(c)

3
(d)

4
Answer:

Option (b)

26.

8051 has ..................no. of I/O pins

(a)

8
(b)

16
(c)

32
(d)

24
Answer:

Option (c)

27.

8051 has .......... no of serial ports

(a)

1
(b)

2
(c)

3
(d)

4
Answer:

Option (a)

28.

8051 has .............no of interupts

(a)

3
(b)

4
(c)

5
(d)

6
Answer:

Option (d)

29.

A micro controller has which of the following devices on cheap

(a)

RAM
(b)

ROM
(c)

I/O
(d)

ALL of the above
Answer:

Option (d)

30.

A general purpose microprocessor normally needs which of the following devices to be attached to it

(a)

RAM 
(b)

ROM
(c)

I/O
(d)

ALL OF THE ABOVE
Answer:

Option (d)

Showing 21 to 30 out of 89 Questions
1 2 3 4 5 6