Discussion
An SPI link in its usual form uses
Answer: D
Correct answer: four wires: clock, two data lines and a select
SPI uses a clock, a master-out line, a master-in line and a slave select - four wires to the first device. The two separate data lines make it full duplex, and because the clock is supplied by the master there is no baud rate to agree and no framing to lose, which is why SPI runs comfortably at tens of megahertz where a UART does not.
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