各位大大安安，想请问PWM_EnablePeriodInt这函数的用法，里面参数PWM_PERIOD_INT_UNDERFLOW和PWM_PERIOD_INT_MATCH_CNR各代表什么意思，谢谢!
/**
* @brief Enable period interrupt of selected channel
* @param[in] pwm The pointer of the specified PWM module
* @param[in] u32ChannelNum PWM channel number. Valid values are between 0~3
* @param[in] u32IntPeriodType Period interrupt type, could be either
* - \ref PWM_PERIOD_INT_UNDERFLOW
* - \ref PWM_PERIOD_INT_MATCH_CNR
* @return None
* @Details This function is used to enable period interrupt of selected channel.
* Every two channels, (0 & 1), (2 & 3), shares the period interrupt type setting.
*/
void PWM_EnablePeriodInt(PWM_T *pwm, uint32_t u32ChannelNum, uint32_t u32IntPeriodType)
{
(pwm)->PIER = ((pwm)->PIER & ~(PWM_PIER_INT01TYPE_Msk << (u32ChannelNum >> 1))) | \
(PWM_PIER_PWMIE0_Msk << u32ChannelNum) | (u32IntPeriodType << (u32ChannelNum >> 1));
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