/**
  **************************************************************************
  * @file     wdt_standby/readme.txt 
  * @version  v2.0.4
  * @date     2022-04-02
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the at-start board, in this demo, the wdt wakeup mcu 
  from standby mode. if the chip is wakeup from standby mode by wdt, led4 
  will be on.
