#2 Embedded Systems Quiz

SPI Protocol Quiz

Click beside the answer you think is correct. You can change your choice before submitting.

1. What is CPHA in SPI?
   Clock Phase
   Clock Polarity
   Chip Select
   None


2. MISO stands for:
   Master Input Slave Output
   Master Input Serial Output
   Master Initiated Serial Output
   None


3. SPI mode 0 corresponds to:
   CPOL=0, CPHA=0
   CPOL=0, CPHA=1
   CPOL=1, CPHA=0
   CPOL=1, CPHA=1


4. Which SPI line can be shared among multiple slaves?
   MISO
   MOSI
   SCK
   CS


5. Maximum practical SPI speed depends on:
   Cable length and device
   Only the master clock
   Only the slave device
   None


6. In SPI, data is shifted out on:
   Rising or falling edge of clock
   Only rising edge
   Only falling edge
   Any edge randomly


7. Which microcontroller pin is often used for CS?
   Any GPIO
   Only SPI pins
   Only ADC pins
   Only PWM pins


8. SPI supports how many slaves without extra logic?
   1
   2
   Unlimited with separate CS
   Only 4


9. SPI is commonly used for:
   Memory devices
   Sensors
   Displays
   All of the above


10. Which is NOT an SPI signal line?
    CLK
    MISO
    SDA
    MOSI


11. SPI uses which type of clocking?
    Asynchronous
    Synchronous
    Phase-locked
    None


12. Which SPI line sends data from Slave to Master?
    MOSI
    MISO
    SCK
    CS


13. SPI clock polarity of 1 means:
    Idle low
    Idle high
    Rising edge active
    Falling edge active


14. Full-duplex SPI means:
    Can only send
    Can only receive
    Send and receive simultaneously
    None


15. When multiple slaves are connected, each CS should be:
    Pulled high to select
    Pulled low to select
    Always high
    Always low


16. SPI is best suited for which distance?
    Long distances (>10m)
    Short distances (<1m)
    Any distance
    Wireless only


17. SPI devices are often referred as:
    Masters and Slaves
    Clients and Servers
    Sources and Sinks
    Publishers and Subscribers


18. SPI slave cannot initiate communication because:
    It has no clock
    MOSI is input only
    CS is always high
    None of the above


19. Which protocol is simpler to implement: I2C or SPI?
    I2C
    SPI
    Both equal
    None


20. Which of the following is a disadvantage of SPI?
    Needs more pins for multiple slaves
    Slower than UART
    Only half duplex
    None