void TIM1_Init(void)
{
  TIM1_IER=0X00;
  TIM1_EGR=0X00;
  TIM1_PSCRH=0X3E;//15999分频，记数周期为1ms
  TIM1_PSCRL=0X7F;
  TIM1_ARRH=0X01;//自动重载寄存器为500，每计数500次产生一次中断
  TIM1_ARRL=0XF4;
  TIM1_CNTRH=0X00;
  TIM1_CNTRL=0X00;
  TIM1_CR1=0X81;
  TIM1_IER=0X01;
}
#pragma vector=TIM1_OVR_UIF_vector
__interrupt void TIM1_OVR_UIF(void)
{
  i++;
  TIM1_SR1=0X00;
  if(i==10)
  {PWMOFF();}
}
编译环境为IAR，目的是10s后pwm输出关闭，硬件测试进不去中断
此帖出自小平头技术问答