msp430x54x_ta3_04.c

MSP430F5XXX的sample code

//******************************************************************************
//  msp430FG5438 Demo - Timer_A3, Toggle P1.0, Overflow ISR, 32kHz ACLK
//
//  Description: Toggle P1.0 using software and the Timer_A overflow ISR.
//  In this example an ISR triggers when TA overflows. Inside the ISR P1.0
//  is toggled. Toggle rate is exactly 0.5Hz. Proper use of the TAIV interrupt
//  vector generator is demonstrated.
//  ACLK = TACLK = 32768Hz, MCLK = SMCLK = default DCO ~1.045MHz
//
//           msp430FG5438
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |           P1.0|-->LED
//
//   M Smertneck
//   Texas Instruments Inc.
//   April 2008
//   Built with CCEv3.2 IAR Embedded Workbench Version: 3.42A
//******************************************************************************

#include <msp430x54x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P1DIR |= 0x01;                            // P1.0 output
  TA1CTL = TASSEL_1 + MC_2 + TAIE;          // ACLK, contmode, interrupt

  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3 w/ interrupt
}

// Timer_A3 Interrupt Vector (TAIV) handler
#pragma vector=TIMER1_A1_VECTOR
__interrupt void Timer_A(void)
{
  switch( TA1IV )
  {
   case  2: break;                          // CCR1 not used
   case  4: break;                          // CCR2 not used
   case  6: break;                          // CCR3 not used
   case  8: break;                          // CCR4 not used
   case  10: break;                         // CCR5 not used
   case  12: break;                         // Reserved not used
   case 14: P1OUT ^= 0x01;                  // overflow
            break;
  }
}