TMS320F28379D 的PWM 软件强制封脉冲失效

EPwm4Regs.AQCSFRC.bit.CSFA = 1; // off
EPwm4Regs.AQCSFRC.bit.CSFB = 1; // off
EPwm5Regs.AQCSFRC.bit.CSFA = 1; // off
EPwm5Regs.AQCSFRC.bit.CSFB = 1; // off
EPwm6Regs.AQCSFRC.bit.CSFA = 1; // off
EPwm6Regs.AQCSFRC.bit.CSFB = 1; // off

A通道全低，B通道全高？我本来想将A,B都拉低的。