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Digital Electronics
‣
The 8051 Microcontroller
Comments
Question
The following program will cause the 8051 to be stuck in a loop:
LOOP:
MOV A, #00H
JNZ LOOP
Options
A. True
B. False
Correct Answer
False
The 8051 Microcontroller problems
Search Results
1. This program code will be executed once:
STAT:
MOV A, #01H
JNZ STAT
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
2. A 0.3-µF capacitor has an initial charge of 2.7 V. If it is discharged through a 10-kΩ resistor for 6.5 ms, how much voltage will be left across the capacitor?
Options
A. 0.0 V
B. 0.309 V
C. 2.7 V
D. 2.295 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.309 V
3. What is another name for a bistable multivibrator?
Options
A. an on-off switch
B. an oscillator
C. a flip-flop
Show Answer
Scratch Pad
Discuss
Correct Answer: a flip-flop
4. The pulse width out of a one-shot multivibrator increases when the:
Options
A. supply voltage increases
B. timing resistor decreases
C. UTP decreases
D. timing capacitance increases
Show Answer
Scratch Pad
Discuss
Correct Answer: supply voltage increases
5. When a capacitor charges:
Options
A. the voltage across the plates rises exponentially
B. the circuit current falls exponentially
C. the capacitor charges to the source voltage in 5×
RC
seconds
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: all of the above
6. MOV A, @ R1 will:
Options
A. copy R1 to the accumulator
B. copy the accumulator to R1
C. copy the contents of memory whose address is in R1 to the accumulator
D. copy the accumulator to the contents of memory whose address is in R1
Show Answer
Scratch Pad
Discuss
Correct Answer: copy the contents of memory whose address is in R1 to the accumulator
7. Data transfer from I/O to external data memory can only be done with the MOV command.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
8. The total amount of external code memory that can be interfaced to the 8051 is:
Options
A. 32K
B. 64K
C. 128K
D. 256K
Show Answer
Scratch Pad
Discuss
Correct Answer: 64K
9. The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
10. When the 8051 is reset and the
line is HIGH, the program counter points to the first program instruction in the:
Options
A. internal code memory
B. external code memory
C. internal data memory
D. external data memory
Show Answer
Scratch Pad
Discuss
Correct Answer: internal code memory
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