用msp430 f2132芯片，想精确计时到ms级别。 结果测试时间误差很大，计时比实际实际多近1/10，另外还有一个问题，缺省smclk的时钟是1Mhz的吗? 代码如下：   void TimerAInit(void)
{   TACTL=TASSEL_2+TACLR+MC_0+ID_0; //选择时钟源为SMCLK,   TACCTL0 = CCIE;                                       TACCR0=1000;
  TACTL |= MC_1;             msTime =0;
  sTime =0;
 
}
unsigned short getMsTime()
{
  return msTime;
}
unsigned short getSTime()
{
  return sTime;
} #pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer0Process(void)
{ 
  msTime++;
  if(msTime ==1000)
  {
       sTime++;
       msTime=0;   
  }
}   main() {   unsigned short msTmp =0;
  unsigned short sTmp =0;  WDTCTL = WDTPW + WDTHOLD;
  _BIS_SR(GIE);  
  TimerAInit();  
  while(1)
  {
    deciMsTmp = getDeciMsTime();
    msTmp = getMsTime();
    sTmp = getSTime(); 
  }; } [ 本帖最后由 desertriver 于 2010-11-4 16:02 编辑 ] 此帖出自小平头技术问答