The 8051 Microcontroller problems
- 1. 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
Correct Answer: serial port input
- 2. The following command will copy the accumulator to the location whose address is 23H:
MOV 23H,A
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. 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
Correct Answer: external code memory
- 4. 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
Correct Answer: ADD A, R3
- 5. 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
Correct Answer: MOV R6, A
- 6. The statement LCALL READ passes control to the line labelled READ.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. Data transfer from I/O to external data memory can only be done with the MOVX command.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. This program code will be executed continuously:
STAT: MOV A, #01H JNZ STAT
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. A HIGH on which pin resets the 8051 microcontroller?
Options- A. RESET
- B. RST
- C. PSEN
- D. RSET Discuss
Correct Answer: RST
- 10. The start-conversion on the ADC0804 is done by using the:
Options- A.
- B. CS line
- C. INTR line
- D. V ref/2 line Discuss
Correct Answer:
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