请教：STM32定时器中的预分频参数疑问

只看该作者 · 2009-9-30 09:42

/* ---------------------------------------------------------------
TIM2 Configuration: Output Compare Timing Mode:
TIM2CLK = 36 MHz, Prescaler = 4, TIM2 counter clock = 36/(1+4)=7.2 MHz
CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz
CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 Hz
CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4 Hz
CC4 update rate = TIM2 counter clock / CCR4_Val =  878.9 Hz
  --------------------------------------------------------------- */

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;这里有一个预分频参数
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* Prescaler configuration */
  TIM_PrescalerConfig(TIM2, 4, TIM_PSCReloadMode_Immediate);这里也有一个预分频参数

请问两个预分频参数区别在哪里？
还有TIM_TimeBaseStructure.TIM_ClockDivision = 0;这个参数具体作用是什么？

只看该作者 · 2009-10-9 17:52

顶一下