I2C vs SPI Comparison
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Questions and Answers

Which of the following statements about I2C and SPI is true?

  • SPI provides acknowledgment for each byte sent.
  • I2C requires a slave select pin for communication.
  • I2C uses two wires for communication. (correct)
  • SPI supports multi-master communication.

What feature distinguishes I2C from SPI regarding data transfer acknowledgment?

  • SPI verifies that data is received correctly every time.
  • I2C ensures that the data sent is received correctly by the slave. (correct)
  • I2C does not support acknowledgment bits.
  • SPI provides an acknowledgment bit after every byte.

Which statement accurately describes the power consumption characteristics of I2C and SPI?

  • Both I2C and SPI consume the same amount of power.
  • I2C draws less power compared to SPI.
  • I2C consumes more power than SPI. (correct)
  • SPI draws more power than I2C.

Which of the following is true regarding the communication protocols of I2C and SPI?

<p>SPI lacks support for clock stretching. (D)</p> Signup and view all the answers

What is a significant limitation of SPI compared to I2C?

<p>SPI cannot provide acknowledgment for each byte. (A)</p> Signup and view all the answers

Regarding susceptibility to noise, which protocol is generally considered better?

<p>I2C is less susceptible to noise than SPI. (D)</p> Signup and view all the answers

Which statement correctly describes the arbitration feature in I2C?

<p>I2C utilizes arbitration to manage conflicts between multiple masters. (C)</p> Signup and view all the answers

What is the principal difference in wire usage between I2C and SPI?

<p>SPI typically requires three or four wires, while I2C operates with two. (B)</p> Signup and view all the answers

Which aspect of I2C communication leads to increased overhead compared to SPI?

<p>The inclusion of start and stop bits. (B)</p> Signup and view all the answers

What happens when the CCP1 interrupt flag is set?

<p>The interrupt service routine for CCP1 is executed. (A)</p> Signup and view all the answers

What is the purpose of the line 'movlw b'00000001'' within the Timer1 configuration?

<p>To set the prescaler to 1:1 for Timer1. (C)</p> Signup and view all the answers

In the code provided, what is the role of the instruction 'BCF STATUS, RP0'?

<p>It switches the bank back to Bank 0. (D)</p> Signup and view all the answers

How is the PORTA configured before entering the main loop?

<p>All pins are set as digital inputs. (C)</p> Signup and view all the answers

What does the instruction 'movf CCPR1L, W' accomplish in the interrupt service routine?

<p>It reads the lower byte of the captured value into the W register. (A)</p> Signup and view all the answers

What is the effect of the instruction 'bsf INTCON, GIE' in the configuration sequence?

<p>It enables global interrupts in the system. (B)</p> Signup and view all the answers

Why is the instruction 'goto mainloop' placed after the interrupt handling?

<p>To maintain the loop until another interrupt occurs. (A)</p> Signup and view all the answers

What are the functionalities set by the configuration bits in the program?

<p>Setting the oscillator type and configuring the watchdog timer behavior. (C)</p> Signup and view all the answers

What does 'EQU' signify in the statement 'temp EQU 0x20'?

<p>Creates an alias for a specific memory address. (B)</p> Signup and view all the answers

In the setup of PORTB, what does setting 'MOVLW 0xFF' achieve?

<p>All PORTB pins are set to input mode. (A)</p> Signup and view all the answers

Flashcards

I2C

A multi-master, multi-slave, half-duplex communication protocol using two wires: clock (SCL) and data (SDA).

SPI

A full-duplex communication protocol that uses multiple wires (typically 3 or 4) including MOSI, MISO, and SCLK.

Multi-master

More than one device can act as the master (initiator of communication).

Multi-slave

More than one device can act as the slave (receiving data).

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Half-duplex

Data can be sent in one direction at a time.

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Full-duplex

Data can be sent in both directions simultaneously.

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Clock Stretching

A feature in I2C allowing a slave to slow or stall the clock speed to handle data more slowly.

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Address-based Protocol

In I2C, each device has a unique address, like a house number or phone number, to be selected for communication.

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Arbitration

I2C's process of resolving conflicts when multiple master devices try to initiate communication simultaneously.

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Pull-up Resistor

A resistor used in I2C to ensure consistent clock timing and signal stability.

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PIC16F818

A specific type of microcontroller chip

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Configuration Bits

Bits in a microcontroller configuration that set how the chip operates

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XT Oscillator

A crystal-less clocking method

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Watchdog Timer

A timer used to reset the microcontroller if something goes wrong

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Power-up Timer

A timer that runs on startup

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Code Protection

Security feature to prevent a program from being altered

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PORTA

A group of pins used for input/output. Here, inputs

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PORTB

A group of pins used for output. Here, outputs

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ADCON1

A register to configure input pins as digital

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TRISA

A register to configure PORTA pins as inputs or outputs

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TRISB

A register to configure PORTB pins as inputs or outputs.

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CCP1

A capture/compare module used for timing

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CCP1CON

Register used to configuring CCP1

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CCP1IE

Enables CCP1 interrupt

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Capture mode

Measures the time between events

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CCPR1L

Lower byte of capture register

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CCPR1H

Higher byte of capture register

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PIR1

Interrupt flag register

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CCP1IF

Interrupt flag for CCP1

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GIE

Global Interrupt Enable

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PEIE

Peripheral Interrupt Enable

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ISR

Interrupt Service Routine

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retfie

Return from interrupt and enable interrupts

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EQU

Defines an EQUate (a symbolic name for a memory address)

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Study Notes

I2C vs SPI

  • I2C: Can be multi-master and multi-slave (more than one master and slave on the bus)
  • I2C: Half-duplex communication protocol
  • I2C: Supports clock stretching (slave slows down data transmission if necessary)
  • I2C: Uses two wires (one for data, one for clock)
  • I2C: Slower than SPI
  • I2C: Draws more power than SPI
  • I2C: Less susceptible to noise than SPI
  • I2C: Cheaper to implement than SPI
  • I2C: Uses pull-up resistor
  • I2C: Acknowledgment bit after each byte to confirm data transmission
  • I2C: Supports multi-master communication (multiple masters on the bus)
  • I2C: Multi-master communication protocol with arbitration feature (to resolve contention between masters)
  • I2C: Address-based communication protocol (needs a specific address for each slave)
  • I2C: Has start and stop bits in communication
  • I2C: Supports multiple devices on the same bus without extra select lines. I2C is better for long distances.
  • I2C: Developed by NXP

SPI

  • SPI: Can be multi-slave but not multi-master (only one master on the bus)
  • SPI: Full-duplex communication protocol
  • SPI: No clock stretching feature
  • SPI: Needs three or four wires (MOSI, MISO, SCL, chip select) for communication (depends on configuration)
  • SPI: Faster than I2C
  • SPI: Draws less power than I2C
  • SPI: More susceptible to noise than I2C
  • SPI: Costlier to implement than I2C
  • SPI: Doesn't require a pull-up resistor
  • SPI: No acknowledgment bit
  • SPI: Doesn't verify data transmission correctly
  • SPI: Doesn't support multi-master communication
  • SPI: Not a multi-master communication protocol; does not have arbitration
  • SPI: Needs slave select pin to select a specific slave for communication
  • SPI: Does not have start and stop bits
  • SPI: Requires extra signal lines (slave select) for multiple devices
  • SPI: Better for short distances
  • SPI: Developed by Motorola

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I2C vs SPI Comparison PDF

Description

Explore the differences between I2C and SPI communication protocols in this quiz. Learn about their structures, advantages, and disadvantages, as well as their specific use cases. This quiz is perfect for anyone looking to understand the fundamentals of digital communication techniques.

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