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DSP2808 PWM

DSP2808 PWM 一直输出互补波形

想通过下面2句,让PWM6A/B输出低电平,但实际测出来还是互补的

EPwm6Regs.AQCSFRC.bit.CSFA =1;    

EPwm6Regs.AQCSFRC.bit.CSFB =1;