/**
  **************************************************************************
  * @file     readme.txt
  * @version  v2.0.0
  * @date     2021-11-26
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the at-start board, in this demo, shows how to exit
  deepsleep mode by interrupt of ertc tamper.
  
  the rising edge on pc13 will wake up deepsleep mode
