lab-05a.c

MSP430FG4619的TimerA子程序

//******************************************************************************
//  MSP430xG46x Demo - Timer_A, Toggle P5.1, TACCR0 Cont. Mode ISR, DCO SMCLK
//
//  Description: Toggle P5.1 using software and TA_0 ISR. Toggles every
//  50000 SMCLK cycles. SMCLK provides clock source for TACLK. During the
//  TA_0 ISR, P5.1 is toggled and 50000 clock cycles are added to TACCR0.
//  TA_0 ISR is triggered every 50000 cycles. CPU is normally off and
//  used only during TA_ISR.
//  ACLK = 32.768kHz, MCLK = SMCLK = TACLK = Default DCO
//
//           MSP430xG461x
//         ---------------
//     /|\|            XIN|-
//      | |               |   32kHz
//      --|RST        XOUT|-
//        |               |
//        |           P5.1|-->LED
//
//   FengLF
//   LSD SCIENCE& TECHNOLOGY CO.,LTD 
//   2007.06
//   Built with IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include <msp430xG46x.h>

void main(void)
{
  volatile unsigned int i;

  WDTCTL = WDTPW +WDTHOLD;                  // 关看门狗
  FLL_CTL0 |= XCAP14PF;                     // 设置装载电容

  // Wait for xtal to stabilize
  do
  {
  IFG1 &= ~OFIFG;                           // 清晶振失效标志位
  for (i = 0x47FF; i > 0; i--);             // 延时等待晶振稳定
  }
  while ((IFG1 & OFIFG));                   // 晶振失效标志仍存在？

  P5DIR |= 0x02;                            // P5.1 输出方向
  TACCTL0 = CCIE;                           // TACCR0中断使能
  TACCR0 = 50000;
  TACTL = TASSEL_2 + MC_2;                  // TA时钟 SMCLK, 连续模式
  _BIS_SR(LPM0_bits + GIE);                 // 开中断，进入低功耗0
}

// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
  P5OUT ^= 0x02;                            // 翻转 P5.1
  TACCR0 += 50000;                          // TACCR0 加上50000
}