TIMx_OCMODE_TOGGLE   //此模式或产生任意频率的50%占空比方波 (FOSC/分频系数)/(2*TIM2_Period)
  TIMx_OCMODE_PWM1    //PWM模式可设置PWM一周期的时钟数,并调可节占空比
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<ol start="1" class="dp-c">    <li class="alt">#include "stm8s.h"      #include "stm8s_tim2.h"  
    <li class="alt">#include "stm8s_tim3.h"      u16 CCR1_Val = 300;  
    <li class="alt">u16 CCR2_Val = 100;      u16 CCR3_Val = 100;  
    <li class="alt">void main(void)      {   
    <li class="alt">  CLK_HSECmd(ENABLE);//外部时钟开        CLK_LSICmd(ENABLE);//使能内部低频RC  
    <li class="alt">  CLK_HSICmd(ENABLE);//使能内部高频RC         CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV1);//内部高速RC振荡时钟分频  
    <li class="alt">  CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);//CPU核心时钟分频           CLK_ClockSwitchCmd(ENABLE); //切换使能  
    <li class="alt">  CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO ,CLK_SOURCE_HSE,DISABLE,CLK_CURRENTCLOCKSTATE_DISABLE);//切换配置        
    <li class="alt">  TIM3_TimeBaseInit(TIM3_PRESCALER_1, 1024);          
    <li class="alt">  TIM3_OC1Init(TIM3_OCMODE_TOGGLE, TIM3_OUTPUTSTATE_ENABLE,CCR1_Val, TIM3_OCPOLARITY_HIGH);//此模式或产生任意频率的50%占空比方波 (FOSC/分频系数)/(2*TIM2_Period)        TIM3_OC1PreloadConfig(ENABLE);    
    <li class="alt">          TIM3_OC2Init(TIM3_OCMODE_TOGGLE, TIM3_OUTPUTSTATE_ENABLE,CCR1_Val, TIM3_OCPOLARITY_HIGH);//此模式或产生任意频率的50%占空比方波 (FOSC/分频系数)/(2*TIM2_Period)  
    <li class="alt">  TIM3_OC2PreloadConfig(ENABLE);            
    <li class="alt">  TIM3_ARRPreloadConfig(ENABLE);        TIM3_Cmd(ENABLE);  
    <li class="alt">          /* Time base configuration */  
    <li class="alt">  TIM2_TimeBaseInit(TIM2_PRESCALER_1, 1024);        TIM2_OC1Init(TIM2_OCMODE_PWM1, TIM2_OUTPUTSTATE_ENABLE,CCR1_Val, TIM2_OCPOLARITY_HIGH);//PWM模式可设置PWM一周期的时钟数,并调可节占空比  
    <li class="alt">  TIM2_OC1PreloadConfig(ENABLE);          
    <li class="alt">  TIM2_OC2Init(TIM2_OCMODE_PWM1, TIM2_OUTPUTSTATE_ENABLE,CCR1_Val, TIM2_OCPOLARITY_HIGH);//PWM模式可设置PWM一周期的时钟数,并调可节占空比        TIM2_OC2PreloadConfig(ENABLE);    
    <li class="alt">  TIM2_ARRPreloadConfig(ENABLE);        TIM2_Cmd(ENABLE);  
    <li class="alt">        while (1)  
    <li class="alt">  {          DelayUs(1000);  
    <li class="alt">    if(CCR1_Val

来点注释就好了