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

  this demo is based on the ht32f49041_sk board, in this demo, pa2, pa6 and pa8
  output pwm waveform. the tmrxclk is fixed to 96 mhz, the tmr3 counter clock
  is 96 mhz.
  the master tmrer tmr3 is running at 301 khz and the duty cycle is equal to 20%
  the tmr3 is running:
  - at (tmr1 frequency)/ (tmr3 period + 1) = 29.98 khz and a duty cycle
  equal to tmr3_c1dt/(tmr3_pr + 1) = 30%
  the tmr15 is running:
  - at (tmr1 frequency)/ (tmr15 period + 1) = 59.95 khz and a duty cycle
  equal to tmr15_c1dt/(tmr15_pr + 1) = 60%
