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A UART link is described as asynchronous because

  • A.no clock is sent with the data
  • B.the two ends may use different baud rates from one another
  • C.characters may be sent only when the receiver requests them
  • D.the data is carried on a differential pair of wires

Answer: A

The receiver recovers timing from the start bit and then samples at intervals it derives from its own clock, which is why the two ends must agree on the baud rate in advance. A synchronous link such as SPI carries the clock alongside the data.

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