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TMS320F28027: 参考的tidm_hv_1ph_dcac这个项目的代码，主芯片是TMS320F28004X，但代码疑问如下：

Inver
Prodigy 140 points

Part Number: TMS320F28027

setupInverterPWM(INV_PWM1_BASE,INV_PWM2_BASE,INV_PWM_PERIOD,INV_DEADBAND_PWM_COUNT,INV_DEADBAND_PWM_COUNT);

上面这个函数体里面   EPWM_setTimeBasePeriod(base1,pwm_period_ticks >>1);  pwm_period_ticks为什么会右移一位即除以2，难道是PWM的时钟被分频了？但我在代码中没看到的，谢谢！