STM32定时器触发ADC采样+DMA中断数据转运，配置PWM的死区会影响进入DMA中断的原因？

tiM_BDTRInitStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Disable;
        TIM_BDTRInitStructure.TIM_Break=TIM_Break_Disable;
        TIM_BDTRInitStructure.TIM_BreakPolarity=TIM_BreakPolarity_High;
        TIM_BDTRInitStructure.TIM_DeadTime=0xD4;
        TIM_BDTRInitStructure.TIM_LOCKLevel=TIM_LOCKLevel_1;
        TIM_BDTRInitStructure.TIM_OSSIState=TIM_OSSIState_Enable;
        TIM_BDTRInitStructure.TIM_OSSRState=TIM_OSSRState_Enable;
        TIM_BDTRConfig(TIM1, TIM_BDTRInitStructure);
这是我的死区配置，发现配置死区后ADC每触发三次采样，却只进入两次DMA中断，不配置死区就能正常进入中断。
哪位大佬解惑，谢谢啦。