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- Question
An alternate function of port pin P3.0 (RXD) in the 8051 is:
Options- A. serial port input
- B. serial port output
- C. memory write strobe
- D. memory read strobe
- Correct Answer
- serial port input
- 1. The following command will rotate the 8 bits of the accumulator one position to the left:
RL A
Options- A. True
- B. False Discuss
- 2. Which of the following commands will copy the contents of location 4H to the accumulator?
Options- A. MOV A, 04H
- B. MOV A, L4
- C. MOV L4, A
- D. MOV 04H, A Discuss
- 3. The 8-bit address bus allows access to an address range of:
Options- A. 0000 to FFFFH
- B. 000 to FFFH
- C. 00 to FFH
- D. 0 to FH Discuss
- 4. The 8051 can handle ________ interrupt sources.
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
- 5. This program code will read data from port 0 and write it to port 2, and it will stop looping when bit 3 of port 2 is set:
STAT: MOV A, PO MOV P2,A JNB P2.3, STAT
Options- A. True
- B. False Discuss
- 6. The following command will copy the accumulator to the location whose address is 23H:
MOV 23H,A
Options- A. True
- B. False Discuss
- 7. When the 8051 is reset and the EA line is LOW, 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
- 8. Which of the following statements will add the accumulator and register 3?
Options- A. ADD @R3, @A
- B. ADD @A, R3
- C. ADD R3, A
- D. ADD A, R3 Discuss
- 9. Which of the following instructions will move the contents of the accumulator to register 6?
Options- A. MOV 6R, A
- B. MOV R6, A
- C. MOV A, 6R
- D. MOV A, R6 Discuss
- 10. The statement LCALL READ passes control to the line labelled READ.
Options- A. True
- B. False Discuss
The 8051 Microcontroller problems
Search Results
Correct Answer: True
Correct Answer: MOV A, 04H
Correct Answer: 00 to FFH
Correct Answer: 5
Explanation:
There are five interrupt sources for the 8051, which means that they can recognize 5 different events that can interrupt regular program execution. Each interrupt can be enabled or disabled by setting bits of the IE register. Likewise, the whole interrupt system can be disabled by clearing the EA bit of the same register.
Correct Answer: True
Correct Answer: True
Correct Answer: external code memory
Correct Answer: ADD A, R3
Correct Answer: MOV R6, A
Correct Answer: True
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