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TMS320F280049C: T1 event的问题

Part Number: TMS320F280049C

如下图,在【T1 event】出现和【T1 event】消失的时候,都会触发【PWM1A】的action

请问如何只在【T1 event】出现的时候触发【PWM1A】的action,【T1 event】消失的时候不要触发【PWM1A】的action

            【T1 event】触发的action定义为【toggle】,如下面这行代码

            EPWM_setActionQualifierAction(myEPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_TOGGLE, EPWM_AQ_OUTPUT_ON_T1_COUNT_UP);