The 8051 Microcontroller Questions and Answers

Practice Mode
Showing 10 of 59 questions
Q31
When the 8051 is reset and the EA line is LOW, the program counter points to the first program instruction in the:
  • A internal code memory
  • B external code memory
  • C internal data memory
  • D external data memory
Answer: Option B
Q32
The designs of a centigrade thermometer and a PWM speed-control circuit can be implemented by the 8051.
  • A TRUE
  • B FALSE
Answer: Option A
Q33
What is the difference between the 8031 and the 8051?
  • A The 8031 has no interrupts.
  • B The 8031 is ROM-less.
  • C The 8051 is ROM-less.
  • D The 8051 has 64 bytes more memory.
Answer: Option B
Q34
To interface external EPROM memory for applications, it is necessary to demultiplex the address/data lines of the 8051.
  • A TRUE
  • B FALSE
Answer: Option A
Q35
The following command will copy the accumulator to the location whose address is 23H: MOV 23H,A
  • A TRUE
  • B FALSE
Answer: Option A
Q36
The special function registers can be referred to by their hex addresses or by their register names.
  • A TRUE
  • B FALSE
Answer: Option A
Q37
The contents of the accumulator after this operation MOV A,#2BH ORL A,00H will be:
  • A 1B H
  • B 2B H
  • C 3B H
  • D 4B H
Answer: Option B
Q38
The following program will cause the 8051 to be stuck in a loop: LOOP:     MOV A, #00H      JNZ LOP
  • A TRUE
  • B FALSE
Answer: Option B
Q39
Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1?
  • A MOV @ P1, R0
  • B MOV @ R0, P1
  • C MOV P1, @ R0
  • D MOV P1, R0
Answer: Option C
Q40
The statement CALL READ passes control to the line labelled READ.
  • A TRUE
  • B FALSE
Answer: Option A

📚 More from Digital Electronics

← All Topics 🎯 Practice ⏱️ Take Test 🔍 Search
Digital Electronics
Back to Digital Electronics
Other Subjects
Questions and Answers for Competitive Exams Various Entrance Test