看datasheet，没有发现专门的启动信号，好像只说写ATDCTL5可以start a new conversion，不太明白，是只要写一次ATDCTL5就能启动AD转换吗？想用查询方式读出转换结果，可是状态寄存器的值总不变，我觉得AD转换没有被启动。

请懂得人指点一下，谢谢！

我的程序如下，每次到if ((ATDSTAT1&0x01)==0x01)就判断不过去了，ATDSTAT1的值总是0x00，是不是说明根本没有开始进行转换呢？
请帮忙分析一下吧

#include /* common defines and macros */
#include /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12c32"

void ATDInit(void){
ATDCTL2 = 0x02; //Enable ATD sequence completion interrupt
ATDCTL3 = 0x22; //number of conversition per sequence is 4,non-FIFO mode
ATDCTL4 = 0x04; //10-bit resolution,second phase is 2 clock cycle,ATD clock is 800K
ATDDIEN = 0xFF; //disable digital input
}
#define RESULT_SIZE 20
void main(void) {
static unsigned char result[RESULT_SIZE];
unsigned char i = 0;
unsigned char rc;
ATDInit();

/* put your own code here */
EnableInterrupts;

for(;;) {
rc = ATDCTL5;
ATDCTL5 = 0x00;
if ((ATDSTAT1&0x01)==0x01)
{
result = ATDDR0H;
i++;
result = ATDDR0L;
i++;
}
} /* wait forever */
/* please make sure that you never leave this function */
}