The 8051 Microcontroller problems
- 1. This program code will be executed once:
STAT: MOV A, #01H JNZ STAT
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. 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
Correct Answer: False
- 3. 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
Correct Answer: copy the contents of memory whose address is in R1 to the accumulator
- 4. Data transfer from I/O to external data memory can only be done with the MOV command.
Options- A. True
- B. False Discuss
Correct Answer: False
- 5. 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
Correct Answer: 64K
- 6. 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
Correct Answer: True
- 7. 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 Discuss
Correct Answer: internal code memory
- 8. Both registers TL0 and TL1 are needed to start Timer 0.
Options- A. True
- B. False Discuss
Correct Answer: False
- 9. Microcontrollers often have:
Options- A. CPUs
- B. RAM
- C. ROM
- D. all of the above Discuss
Correct Answer: all of the above
- 10. An alternate function of port pin P3.4 in the 8051 is:
Options- A. Timer 0
- B. Timer 1
- C. interrupt 0
- D. interrupt 1 Discuss
Correct Answer: Timer 0
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