Discussion
Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
- Question
This program code will be executed once:
STAT: MOV A, #01H JNZ STAT
Options- A. True
- B. False
- Correct Answer
- False
- 1. 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 Discuss
- 2. What is another name for a bistable multivibrator?
Options- A. an on-off switch
- B. an oscillator
- C. a flip-flop Discuss
- 3. 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 Discuss
- 4. 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 Discuss
- 5. The output of the astable circuit ________.
Options- A. constantly switches between two states
- B. is LOW until a trigger is received
- C. is HIGH until a trigger is received
- D. floats until triggered Discuss
- 6. The following program will cause the 8051 to be stuck in a loop:
LOOP: MOV A, #00H JNZ LOOP
Options- A. True
- B. False Discuss
- 7. 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 Discuss
- 8. Data transfer from I/O to external data memory can only be done with the MOV command.
Options- A. True
- B. False Discuss
- 9. The total amount of external code memory that can be interfaced to the 8051 is:
Options- A. 32K
- B. 64K
- C. 128K
- D. 256K Discuss
- 10. The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.
Options- A. True
- B. False Discuss
The 8051 Microcontroller problems
Search Results
Correct Answer: 0.309 V
Correct Answer: a flip-flop
Correct Answer: supply voltage increases
Correct Answer: all of the above
Correct Answer: constantly switches between two states
Correct Answer: False
Correct Answer: copy the contents of memory whose address is in R1 to the accumulator
Correct Answer: False
Correct Answer: 64K
Correct Answer: True
Comments
There are no comments.More in Digital Electronics:
Programming
Copyright ©CuriousTab. All rights reserved.