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  *  Filename:       cpu_doc.h
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  //! \addtogroup cpu_api
  //! @{
  //! \section sec_cpu Introduction
  //!
  //! The CPU API provides a set of functions performing very low-level control of the system CPU.
  //! All functions in this API are written in assembler in order to either access special registers
  //! or avoid any compiler optimizations. Each function exists in several compiler specific versions:
  //! One version for each supported compiler.
  //! @}
  