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The layer that hides the differences between two microcontrollers of the same family is usually called

  • A.the device tree
  • B.the hardware abstraction layer
  • C.the board support package
  • D.the application programming interface of the driver

Answer: B

It sits below the driver and offers uniform register access and clock and pin services, so a driver written once compiles for several parts. The board support package is the layer above it that says what is fitted on this particular board.

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