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现象：因为是变频控制，所以每个PWM的周期值都在改变，现在还需要增加一个90度移像的PWM，如果直接使用移像寄存器EPwm2Regs.TBPHS.half.TBPHS进行90度移像，那么在每个PWM周期里都需要改变移像寄存器的值。 问题：这样每个PWM周期都操作改变移像寄存器的值是否可以？
