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28035 PWM2与PWM1同步,滞后180度,滞后角度会变化



测试中,将PWM2与PWM1进行时钟同步,脉宽相同,目前滞后0度(后续需要滞后任意角度),由于是变频控制,周期寄存器的值在一直调节。

刚开机没有调节时,PWM2的脉宽滞后PWM1 100ns左右,可以介绍,运行过程中缓慢调节周期寄存器的值,PWM2的脉宽滞后PWM1的时间慢慢增加,最后差不多滞后1us左右,是什么原因引起的呢?