Discussion
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- Question
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
- Correct Answer
- MOV A, 04H
- 1. 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
- 2. The 8051 can handle ________ interrupt sources.
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
- 3. 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
- 4. This statement will set the address of the bit to 1 (8051 Micro-controller):
SETB 01H
Options- A. True
- B. False Discuss
- 5. Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.
Options- A. True
- B. False Discuss
- 6. The following command will rotate the 8 bits of the accumulator one position to the left:
RL A
Options- A. True
- B. False Discuss
- 7. 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 Discuss
- 8. The following command will copy the accumulator to the location whose address is 23H:
MOV 23H,A
Options- A. True
- B. False Discuss
- 9. 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
- 10. 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
The 8051 Microcontroller problems
Search Results
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: False
Correct Answer: True
Correct Answer: True
Correct Answer: serial port input
Correct Answer: True
Correct Answer: external code memory
Correct Answer: ADD A, R3
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