The 8051 Microcontroller Questions and Answers

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Showing 10 of 59 questions
Q11
A label is used to name a single line of code.
  • A TRUE
  • B FALSE
Answer: Option A
Q12
Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.
  • A TRUE
  • B FALSE
Answer: Option A
Q13
An alternate function of port pin P3.4 in the 8051 is:
  • A Timer 0
  • B Timer 1
  • C interrupt 0
  • D interrupt 1
Answer: Option A
Q14
Both registers TL0 and TL1 are needed to start Timer 0.
  • A TRUE
  • B FALSE
Answer: Option B
Q15
The I/O ports that are used as address and data for external memory are:
  • A ports 1 and 2
  • B ports 1 and 3
  • C ports 0 and 2
  • D ports 0 and 3
Answer: Option C
Q16
The last 96 locations in the internal data memory are reserved for general-purpose data storage and stack.
  • A TRUE
  • B FALSE
Answer: Option B
Q17
Microcontrollers often have:
  • A CPUs
  • B RAM
  • C ROM
  • D all of the above
Answer: Option D
Q18
The total external data memory that can be interfaced to the 8051 is:
  • A 32K
  • B 64K
  • C 128K
  • D 256K
Answer: Option B
Q19
Which of the following instructions will load the value 35H into the high byte of timer 0?
  • A MOV TH0, #35H
  • B MOV TH0, 35H
  • C MOV T0, #35H
  • D MOV T0, 35H
Answer: Option A
Q20
Bit-addressable memory locations are:
  • A 10H through 1FH
  • B 20H through 2FH
  • C 30H through 3FH
  • D 40H through 4FH
Answer: Option B

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