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TMS320F280049C: CLB发出的脉冲与ePWM模块为什么会有一个周期的延迟?

Part Number: TMS320F280049C

其中CLB以PWM1 TBCTR=Zero作为全局输入,通过修改Count0的match2修改占空比PWM2通过修改CMPA修改占空比。
定时器每200us同时修改Count0的match2和CMPA,生成两次满占空比的脉冲,完成后输出低电平。如图所示:
CLB和PWM2同时修改计数值,应该同时发出两个脉冲,但是CLB比PWM2慢一周期这是为什么?