求大神帮忙看一个程序

只看该作者 · 2013-9-28 09:12

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT

  P1DIR |= BIT0;
  P1OUT |= BIT0;

  TA0CCTL0 = CCIE;                         // TACCR0 interrupt enabled
  TA0CCR0 = 50000;
  TA0CTL = TASSEL_2 + MC_2;                // SMCLK, continuous mode

  __bis_SR_register(LPM0_bits + GIE);    // Enter LPM0 w/ interrupt
}

// Timer A0 interrupt service routine
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
  P1OUT ^= BIT0;
  TA0CCR0 += 50000;                      // Add Offset to TACCR0
}

这个程序中
TA0CCTL0 = CCIE;                         // TACCR0 interrupt enabled
  TA0CCR0 = 50000;
  TA0CTL = TASSEL_2 + MC_2;                // SMCLK, continuous mode

  __bis_SR_register(LPM0_bits + GIE);    // Enter LPM0 w/ interrupt
这几句话是什么意思？？？本人是初学者  问的问题没有水平  请见谅先谢过各位了