Q. How many 16-bit timers/counters are available in the 8051 microcontroller?
Solution
The 8051 microcontroller has 2 available 16-bit timers/counters.
Correct Answer:
B
— 2
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Q. How many 8-bit registers does the 8051 microcontroller have?
Solution
The 8051 microcontroller has 32 general-purpose 8-bit registers.
Correct Answer:
C
— 32
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Q. How many external interrupts does the 8051 support?
Solution
The 8051 microcontroller supports 2 external interrupts.
Correct Answer:
B
— 2
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Q. What is the function of the 'TCON' register in the 8051?
-
A.
Timer control
-
B.
Interrupt control
-
C.
Serial communication
-
D.
Port control
Solution
'TCON' is the timer control register that also manages interrupt control in the 8051 microcontroller.
Correct Answer:
B
— Interrupt control
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Q. What is the function of the PSEN pin in the 8051 microcontroller?
-
A.
Program Store Enable
-
B.
Power Supply Enable
-
C.
Peripheral Select Enable
-
D.
Program Select Enable
Solution
The PSEN pin is used for Program Store Enable in the 8051 microcontroller.
Correct Answer:
A
— Program Store Enable
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Q. What is the maximum clock frequency of the 8051 microcontroller?
-
A.
1 MHz
-
B.
12 MHz
-
C.
24 MHz
-
D.
40 MHz
Solution
The maximum clock frequency of the 8051 microcontroller is 12 MHz.
Correct Answer:
B
— 12 MHz
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Q. What is the purpose of the 'MOV' instruction in the 8051 assembly language?
-
A.
To add two numbers
-
B.
To move data from one location to another
-
C.
To compare two values
-
D.
To jump to a different part of the program
Solution
The 'MOV' instruction is used to move data from one location to another in the 8051 assembly language.
Correct Answer:
B
— To move data from one location to another
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Q. What is the purpose of the accumulator in the 8051 microcontroller?
-
A.
Data storage
-
B.
Arithmetic operations
-
C.
Control operations
-
D.
Input/output operations
Solution
The accumulator is primarily used for arithmetic operations in the 8051 microcontroller.
Correct Answer:
B
— Arithmetic operations
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Q. What is the size of the internal RAM in the 8051 microcontroller?
-
A.
128 bytes
-
B.
256 bytes
-
C.
512 bytes
-
D.
64 bytes
Solution
The internal RAM size of the 8051 microcontroller is 128 bytes.
Correct Answer:
A
— 128 bytes
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Q. Which instruction is used to clear a specific bit in the 8051 microcontroller?
-
A.
CLR
-
B.
CPL
-
C.
ANL
-
D.
ORL
Solution
The CLR instruction is used to clear a specific bit in the 8051 microcontroller.
Correct Answer:
A
— CLR
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Q. Which instruction is used to clear a specific bit in the 8051?
-
A.
CLR
-
B.
CPL
-
C.
SETB
-
D.
ANL
Solution
The 'CLR' instruction is used to clear a specific bit in the 8051 microcontroller.
Correct Answer:
A
— CLR
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Q. Which of the following interrupts has the highest priority in the 8051 microcontroller?
-
A.
External Interrupt 0
-
B.
Timer 0 Interrupt
-
C.
External Interrupt 1
-
D.
Timer 1 Interrupt
Solution
External Interrupt 0 has the highest priority in the 8051 microcontroller.
Correct Answer:
A
— External Interrupt 0
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Q. Which of the following is a special function register in the 8051?
-
A.
Accumulator
-
B.
Program Counter
-
C.
Stack Pointer
-
D.
All of the above
Solution
All of the options listed are special function registers in the 8051 microcontroller.
Correct Answer:
D
— All of the above
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Q. Which of the following is not a mode of operation for the 8051 timer?
-
A.
Mode 0
-
B.
Mode 1
-
C.
Mode 2
-
D.
Mode 3
Solution
The 8051 timer has modes 0, 1, and 2, but not mode 3.
Correct Answer:
D
— Mode 3
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Q. Which of the following is NOT a mode of operation for the 8051 timers?
-
A.
Mode 0
-
B.
Mode 1
-
C.
Mode 2
-
D.
Mode 3
Solution
The 8051 timers operate in modes 0, 1, and 2, but there is no mode 3.
Correct Answer:
D
— Mode 3
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Q. Which pin of the 8051 microcontroller is used for external interrupt 0?
-
A.
P0.0
-
B.
P1.0
-
C.
P2.0
-
D.
P3.2
Solution
External interrupt 0 is connected to pin P3.2 of the 8051 microcontroller.
Correct Answer:
D
— P3.2
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Q. Which port in the 8051 microcontroller is used for serial communication?
-
A.
Port 0
-
B.
Port 1
-
C.
Port 2
-
D.
Port 3
Solution
Port 3 is used for serial communication in the 8051 microcontroller.
Correct Answer:
D
— Port 3
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Q. Which port on the 8051 microcontroller is used for serial communication?
-
A.
Port 0
-
B.
Port 1
-
C.
Port 2
-
D.
Port 3
Solution
Port 3 on the 8051 microcontroller is used for serial communication.
Correct Answer:
D
— Port 3
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Showing 1 to 18 of 18 (1 Pages)
