#include<msp430x54x.h>
void ta0();
void main(  )
{
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  ta0();
  _BIS_SR(LPM3_bits + GIE);
}
#pragma vector=TIMER0_A1_VECTOR
__interrupt void TimerA()
{
  P1OUT ^= BIT4;
}
void ta0()
{
  P1DIR |= 0xFF;
  P1SEL = BIT1+BIT2+BIT0;
  P1OUT &= ~BIT4;
  TA0CCTL = CCIE;
  TA0CCR1 = 20000;
  TA0CTL = TASSEL_1+TAIE;
  TA0CTL |= MC_1;
}

哪位大神帮我看看我这为什么进不了中断