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在使用epwm模块时，当采用递增计数模式且高电平有效情况下，EPwm1Regs.AQCTLA.bit.PRD=AQ_CLEAR和EPwm1Regs.AQCTLA.bit.ZRO=AQ_CLEAR这两句命令貌似可以产生相同的pwm波形。换句话说，是不是当CTR=0时pwm输出低电平和CTR=PRD时pwm输出低电平是一个意思？两句命令能不能随意选一个用？
