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TMS320F280049C: PWM移相值从0到非0后输出波形第一个周期异常

Part Number: TMS320F280049C

PWM配置:PWM1、PWM3周期相同,计数模式都为UP-DOWM,都为50%Duty死区互补模式输出,PWM3相对于PWM1进行移相,同步后计数方向为UP。

问题:当PWM3移相值由0变化为1或2等非0值时,PWM3输出波形的第一个周期异常,异常如下图:

当PWM3移相值由12等非0值变化为其他值时,PWM3输出波形正常