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关于28035的ECAP和EPWM的程序理解问题

你好!我想咨询下在ECAP和EPWM中出现过的事件1,事件2,事件3是指什么?通过下面的例子:

ECap2Regs.ECEINT.bit.CEVT2= 1;            //假如前面设置上升沿捕获,这里的CEVT2是指每出现两次上升沿才产生中断吗?

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(*ePWM[n]).ETSEL.bit.INTSEL = ET_CTR_ZERO;;

(*ePWM[n]).ETPS.bit.INTPRD = 1;//这里是指每当出现一次计数复位清零就产生一次中断吗?