The 8051 Microcontroller Questions and Answers

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Q41
Which of the following commands will copy the contents of location 4H to the accumulator?
  • A MOV A, 04H
  • B MOV A, L4
  • C MOV L4, A
  • D MOV 04H, A
Answer: Option A
Q42
The microcontroller is useful in systems that have nonvariable programs for dedicated applications.
  • A TRUE
  • B FALSE
Answer: Option A
Q43
The total amount of external code memory that can be interfaced to the 8051 is:
  • A 32K
  • B 64K
  • C 128K
  • D 256K
Answer: Option B
Q44
The ADC0804 has ________ resolution.
  • A 4-bit
  • B 8-bit
  • C 16-bit
  • D 32-bit
Answer: Option B
Q45
A HIGH on which pin resets the 8051 microcontroller?
  • A RESET
  • B RST
  • C PSEN
  • D RSET
Answer: Option B
Q46
An alternate function of port pin P3.1 in the 8051 is:
  • A serial port input
  • B serial port output
  • C memory write strobe
  • D memory read strobe
Answer: Option B
Q47
Which of the following instructions will move the contents of the accumulator to register 6?
  • A MOV 6R, A
  • B MOV R6, A
  • C MOV A, 6R
  • D MOV A, R6
Answer: Option B
Q48
The following command will rotate the 8 bits of the accumulator one position to the left: RL A
  • A TRUE
  • B FALSE
Answer: Option A
Q49
An alternate function of port pin P3.0 (RXD) in the 8051 is:
  • A serial port input
  • B serial port output
  • C memory write strobe
  • D memory read strobe
Answer: Option A
Q50
Analog output current must be converted into a usable voltage. To perform this current-to-voltage conversion a 700 op amp may be used.
  • A TRUE
  • B FALSE
Answer: Option A

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