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F28377D中datasheet的一个疑问



如果我用相同的触发条件 来触发四个ADC 的四个通道  比如说ADCA1  ADCB2 ADCC3 ADCD4 这四个通道  如果都是由epwm1 来触发的话 

那这句话  AdcaRegs.ADCSOC1CTL.bit.TRIGSEL = 5 ;AdcbRegs.ADCSOC1CTL.bit.TRIGSEL =5;AdccRegs.ADCSOC1CTL.bit.TRIGSEL = 5;AdcdRegs.ADCSOC1CTL.bit.TRIGSEL = 5;      是写5呢  还是6呢??     A/C B/D 为什么要区分开?