mc9s12xf的ATD配置问题

myfaultyourbad

写了个函数，用于采集单通道，AN1即 adInitialSCH(0)；是可以的CCF【0】是会置位的。
但adInitialSCH(1)；的时候CCF【1】却不会置位，这是为什么？

void adInitialSCH(int channel) {

ATDCTL01_WRAP = 0x0F;//AN15 back
ATDCTL01_ETRIGSEL = 0; // no external triger
ATDCTL01_SRES = 2; //12 bit
ATDCTL01_SMP_DIS = 0;// no discharge
ATDCTL01_ETRIGCH = 0;// not useful now

ATDCTL23_AFFC = 1;// automatic ccf[n] to clear
ATDCTL23_ICLKSTP = 0;// no stop
ATDCTL23_ETRIGP = 0 ;//low     /* External Trigger Polarity */
ATDCTL23_ETRIGLE = 0;//edge   /* External Trigger Level/Edge control */
ATDCTL23_ETRIGE = 0;// foribde externel triger
ATDCTL23_ASCIE = 0;// no interrupt
ATDCTL23_ACMPIE = 0;// no interrupt

ATDCTL23_DJM = 1;// right aligment
ATDCTL23_S8C = 0;
ATDCTL23_S4C = 0;
ATDCTL23_S2C = 0;
ATDCTL23_S1C = 1;// conversion sequence length = 1
ATDCTL23_FIFO = 0;// not FIFo
ATDCTL23_FRZ = 0;//continue when debug

ATDCTL45_SMP = 1;// Sample rate: 4 ATD clk
ATDCTL45_PRS = 0x01;// Fatdclk = Fbus /(2*(PRS+1))

//ATDCMPE = 0;// no compare
//ATDCMPHT = 0;//

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myfaultyourbad

是应该CCF【0】置位。。。