Discussion
Match the bus with its distinguishing feature.
1. I2C 2. SPI 3. CAN
P. Differential pair with non-destructive arbitration Q. Two wires with addressing and acknowledgement R. Full duplex with a select line per device
Answer: A
Correct answer: 1-Q, 2-R, 3-P
Three buses, three quite different designs. I2C is two shared wires with addressing in the protocol and an acknowledgement per byte. SPI is full duplex with a separate select line for each device and no addressing at all. CAN uses a differential pair with non-destructive arbitration, so the highest-priority message wins the bus without any message being lost or corrupted.
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