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A three-wire SPI variant dispenses with

  • A.one of the two data lines, the remaining one being bidirectional
  • B.the clock, timing being recovered from the data
  • C.the chip select, only one device being possible
  • D.the ground return, the supply serving instead

Answer: A

Half duplex operation over a single data line saves a pin where the device never needs to send and receive at once. The clock, the select and the ground are all indispensable, and the clock in particular is what makes SPI synchronous.

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