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当然会不同步，每个PWM都从SYSCLK取时钟，内部晶元上的走线一定是不等长的，再加上外部干扰因素影响，会在一定时间后出现不同的相位差，所以才需要TBPHSEN和SYNCO位来保证每个周期同步一次，这样可以最少程度的减少不对称。
