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The SPI mode number encodes

  • A.the clock polarity and the clock phase
  • B.the number of bits in each transfer
  • C.the maximum clock frequency the slave accepts
  • D.which of the two data lines is used first

Answer: A

Mode zero has an idle-low clock with data sampled on the rising edge; the four modes are the combinations of the two bits. A slave sampling on the wrong edge returns plausible but wrong data, which is a common first-bring-up fault.

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