我在STM8S103K,上能够实现定时器1中的CH1通道可以实现PWM功能，把程序移植到STM8S103F中，就实现不了，但是修改STM8S103F，的通道3和4后，也能输出PWM,这是为什么，程序如下：

void TIMER1_PWMInit(void){

  TIM1_DeInit();//恢复相关寄存器至初始值
TIM1_TimeBaseInit(8, TIM1_COUNTERMODE_UP, 14355, 0);//时基初始化，预分频值1，向上计数，自动重装值49999，重复计数器值0

TIM1_OC4Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, 7050, TIM1_OCPOLARITY_LOW, TIM1_OCIDLESTATE_SET);
TIM1_CCxCmd(TIM1_CHANNEL_4, ENABLE);   //这行区别于T2的PWM
TIM1_OC4PreloadConfig(ENABLE);//输出比较 预装载使能




TIM1_OC3Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE,7500, TIM1_OCPOLARITY_HIGH, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);//输出比较通道3 初始化，匹配时输出电平翻转，启用输出比较，禁
//用输出比较互补输出，脉宽5000，输出比较极性位低电平，互补输出比较极性高电平，输出比较空闲状态高电平，互补输出比较空闲状态低电平
TIM1_CCxCmd(TIM1_CHANNEL_3, ENABLE);   //这行区别于T2的PWM
TIM1_OC3PreloadConfig(ENABLE);//输出比较 预装载使能


TIM1_OC2Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE,7500, TIM1_OCPOLARITY_HIGH, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);
TIM1_CCxCmd(TIM1_CHANNEL_2, ENABLE);   //这行区别于T2的PWM
TIM1_OC2PreloadConfig(ENABLE);//输出比较 预装载使能

TIM1_OC1Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE,7500, TIM1_OCPOLARITY_HIGH, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);
TIM1_CCxCmd(TIM1_CHANNEL_1, ENABLE);   //这行区别于T2的PWM
TIM1_OC1PreloadConfig(ENABLE);//输出比较 预装载使能





TIM1_CtrlPWMOutputs(ENABLE);//使能TIM1 主输出
TIM1_Cmd(ENABLE);//使能TIM1 计数器计数

}