fet140_ta01.c

基于IAR Workbench for MSP430 的MSP430c语言例程,

//******************************************************************************
//  MSP-FET430P140 Demo - Timer_A Toggle P1.0, CCR0 Contmode ISR, DCO SMCLK 
//
//  Description; Toggle P1.0 using software and TA_0 ISR. Toggle rate is 
//  set at 50000 DCO/SMCLK cycles. Default DCO frequency used for TACLK. 
//  Durring the TA_0 ISR P0.1 is toggled and 50000 clock cycles are added to 
//  CCR0.  TA_0 ISR is triggered exactly 50000 cycles. CPU is normally off and
//  used only durring TA_ISR.  
//  ACLK = n/a, MCLK = SMCLK = TACLK = DCO~ 800k 
//   
//
//           MSP430F149
//         ---------------
//     /|\|            XIN|-  
//      | |               |
//      --|RST        XOUT|-
//        |               |
//        |           P1.0|-->LED
//
//  M. Buccini
//  Texas Instruments, Inc
//  September 2003
//  Built with IAR Embedded Workbench Version: 1.26B
//  December 2003
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include <msp430x14x.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  P1DIR |= 0x01;                        // P1.0 output
  CCTL0 = CCIE;                         // CCR0 interrupt enabled
  CCR0 = 50000;
  TACTL = TASSEL_2 + MC_2;              // SMCLK, contmode

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

// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
  P1OUT ^= 0x01;                        // Toggle P1.0
  CCR0 += 50000;                        // Add Offset to CCR0
}