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(*ePWM[ch1]).AQCSFRC.bit.CSFA = 0; /* Forcing disabledd on output A of EPWM1 */\
(*ePWM[ch1]).AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
(*ePWM[ch1]).AQCTLA.bit.CAD = 1; /* Set low when CTR = Zero */\
这些指令执行完到IO口发出PWM为什么总有差不多一个PWM周期的延迟?