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MCQs

Total Questions : 36 | Page 1 of 4 pages
Question 1.  The internal RAM memory of the 8051 is:
  1.    32 bytes
  2.    64 bytes
  3.    128 bytes
  4.    256 bytes
 Discuss Question
Answer: Option C. -> 128 bytes
Question 2.  An alternate function of port pin P3.4 in the 8051 is:
  1.    Timer 0
  2.    Timer 1
  3.    interrupt 0
  4.    interrupt 1
 Discuss Question
Answer: Option A. -> Timer 0
Question 3.  The 8051 has ________ 16-bit counter/timers.
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Question 4.  The 8051 can handle ________ interrupt sources.
  1.    3
  2.    4
  3.    5
  4.    6
 Discuss Question
Answer: Option C. -> 5
Question 5.  The I/O ports that are used as address and data for external memory are:
  1.    ports 1 and 2
  2.    ports 1 and 3
  3.    ports 0 and 2
  4.    ports 0 and 3
 Discuss Question
Answer: Option C. -> ports 0 and 2
Question 6.  When the 8051 is reset and the line is HIGH, the program counter points to the first program instruction in the:
  1.    internal code memory
  2.    external code memory
  3.    internal data memory
  4.    external data memory
 Discuss Question
Answer: Option A. -> internal code memory
Question 7.  MOV A, @ R1 will:
  1.    copy R1 to the accumulator
  2.    copy the accumulator to R1
  3.    copy the contents of memory whose address is in R1 to the accumulator
  4.    copy the accumulator to the contents of memory whose address is in R1
 Discuss Question
Answer: Option C. -> copy the contents of memory whose address is in R1 to the accumulator
Question 8. . The total external data memory that can be interfaced to the 8051 is:
  1.    32K
  2.    64K
  3.    128K
  4.    256K
 Discuss Question
Answer: Option B. -> 64K
Question 9.  The 8051 has ________ parallel I/O ports.
  1.    2
  2.    3
  3.    4
  4.    5
 Discuss Question
Answer: Option C. -> 4
Question 10.  Microcontrollers often have:
  1.    CPUs
  2.    RAM
  3.    ROM
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above

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