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F28027芯片刚烧录时的波形与断电后再上电epwm波形不同

Other Parts Discussed in Thread: C2000WARE

如图(黄色和蓝色分别为epwm4A和B的波形)

原本我的实验从没出现这个问题,然后什么都没动的情况下突然出现了这个问题

刚烧录进来的波形是我想要的波形,但是等断电再上电epwm4就有移位现象出现,请问这个问题怎么解决呢?

(不同频率下移位的时间也不同)