Microcontrollers Quiz: Architecture and Memory
10 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of a microcontroller in an embedded system?

  • To perform complex calculations
  • To act as the control unit (correct)
  • To provide a user interface
  • To store large amounts of data

    • What type of architecture is used in the ATmega328P microcontroller?

  • Harvard architecture (correct)
  • CISC-based architecture
  • Von Neumann architecture
  • RISC-based architecture

    • What is the capacity of the program memory in the ATmega328P microcontroller?

  • 32kB (correct)
  • 4kB
  • 1kB
  • 2kB

    • What is the purpose of the DDRB register in the ATmega328P microcontroller?

    <p>To configure the direction of I/O pins</p> Signup and view all the answers

    What is the minimum voltage required to operate the ATmega328P microcontroller?

    <p>3V</p> Signup and view all the answers

    Which of the following is true about the generation of PWM signals on an Arduino?

    <p>Timers/counters with 2 outputs supply the PWM signals and can only be accessed from specific terminals.</p> Signup and view all the answers

    What special purpose register can be used to change the frequency of the PWM signal on pin 3?

    <p>TCCR2B</p> Signup and view all the answers

    What will be the duty cycle on pin 3 if the analogWrite(3,78) function is used?

    <p>Almost 30%</p> Signup and view all the answers

    What is the potential of the input A0 if X = 5 when using analogRead(A0)?

    <p>Approximately 24mV</p> Signup and view all the answers

    How do you signal a change to the microcontroller when using an external voltage source for the reference voltage?

    <p>By calling the analogReference(EXTERNAL) function</p> Signup and view all the answers

    Study Notes

    PWM Signals on Arduino

    • PWM signals can only be generated on pins 3, 5, 6, 9, 10, and 11 due to three timers/counters that provide the PWM outputs.
    • The timer/counter outputs are exclusively accessible from these specific terminal pins.

    Frequency Control of PWM

    • The frequency of the PWM signal on pin 3 can be changed using the TCCR2B special purpose register.
    • Changing the frequency of pin 3 will also affect pin 11 since both are outputs from the same timer/counter.

    Duty Cycle Calculation

    • For an analogWrite(3, 78), the duty cycle on pin 3 is approximately 30%, calculated as (78 / 255) x 100.

    Analog Readings and Voltages

    • When X = analogRead(A0) results in X = 5 with a reference voltage of 5V, the input potential at A0 is approximately 24mV, calculated using Voltage = (Vr x X) / (2^10).
    • If the potential of input A3 is 1V and the reference voltage is 1.1V, analogRead(A3) returns around 930 based on the same formula.

    External Reference Voltage

    • To use an external voltage source (e.g., 3.3V) as a reference, connect it to the AREF pin and call analogReference(EXTERNAL).

    Interrupts

    • Interrupt requests at terminals INT0 and INT1 are processed as internal interrupts.
    • Pin 12 is not designated as an external interrupt pin.

    Interrupt Statements

    • For PCINT interrupts, it is possible to configure which signal level or edge triggers the interrupt.
    • It is false that internal interrupts cannot be disabled from a program.

    Microcontroller Basics

    • A microcontroller is a type of microcomputer and can serve as the control unit in embedded systems.
    • Microcontroller architecture can resemble that of a microprocessor, but not all microcontrollers are limited to 8-bit architectures.

    Program and Data Memory

    • Microcontrollers typically utilize Flash memory for program storage and SRAM or EEPROM for data memory.
    • The ATmega328P microcontroller features Harvard architecture and RISC instruction set characteristics.

    Data Capacity

    • The ATmega328P has a program memory capacity of 32kB and a data memory size of 2kB.

    Power Supply and Operating Frequency

    • The ATmega328P can operate with a 3V power supply.
    • Maximum clock frequency of the ATmega328P is influenced by the supply voltage level.

    Registers in ATmega328P

    • General and special purpose registers are integral components of the data memory in the ATmega328P.

    Function Calls for Pin Modes

    • To achieve the same result as DDRB = 0x04, the equivalent function call is pinMode(10, OUTPUT).

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of microcontrollers, including their architecture, memory types, and programming. Questions cover topics such as microcontroller vs microprocessor, program memory, and data memory.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser