/**
  *************************************************************************************************************
  * @file     readme.txt
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the ht32f49041_sk board, in this demo, swith sclk to
  pll based hick when hext clock failure occured. pa8 output crm_clkout_pll_div_4
  and led2 fresh per 200 ms.

