fet430_bt01.c

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//******************************************************************************
//  MSP-FET430P430 Demo - BasicTimer Toggle P5.1 using ISR, DCO SMCLK 
//
//  Description; This program will toggle P5.1 by xor'ing P5.1 inside of
//  a basic timer ISR. Default DCO used to clock basic timer. The LED toggles
//  at 2.048 kHz
//
//		  MSP430FG439
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P5.1|-->LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  June 2004
//  Built with IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430xG43x.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  IE2 |= BTIE;                          // Enable BT interrupt
  BTCTL = BTSSEL+BT_fCLK2_DIV256;      
  P5DIR |= 0x02;                        // Set P5.1 to output direction

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

// Basic Timer interrupt service routine
#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer(void)
{
  P5OUT ^= 0x02;                        // Toggle P5.1 using exclusive-OR
}