< ：TI_MSP430_内容页_SA7 --> 我在前面找的一个例子，讲的是捕获
  P1DIR &= ~BIT2; // P1.2 = (InputDirection + TA0.1) = CCIxA.1 --> CCR1
  P1SEL|=BIT2;
  TACCTL1 = CAP + CCIS_0 + CM_3 + CCIE; // Capture CCIxA, both edge, interrupt enable.
  TACTL = TASSEL_1 + MC_2; // ACLK, continuous mode.
_EINT();

volatile unsigned int CCRx = 0;
#pragma vector=TIMER0_A1_VECTOR
__interrupt void TAIV_ISR(void)
{
  unsigned int interval;
  if(TACCTL1 & CCIFG)
  {
    TACCTL1 &=~ CCIFG;
    P1OUT ^= BIT0;
    interval=CCR1-CCRx;
    CCRx=CCR1;
  }
}