/**
  **************************************************************************
  * @file     readme.txt
  * @version  v2.0.5
  * @date     2022-05-20
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the at-start board, in this demo, shows how to exit
  sleep mode by interrupt of usart1 receive data buffer full.

  for more detailed information. please refer to the application note document AN0100.

