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A device driver is the software layer that

  • A.presents a device's function through an interface independent of its registers
  • B.configures the clock tree and the pin multiplexing arrangements of the processor itself
  • C.schedules the tasks that make use of the device
  • D.translates the application's source code into instructions

Answer: A

Everything above it works in terms of open, read and write, or of the driver's own named operations, and knows nothing of bit positions. That separation is what allows the device to be changed without touching the application.

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