fet430_bt02.c

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//******************************************************************************
//  MSP-FET430P430 Demo - BasicTimer Toggle P5.1 using ISR, 32kHz ACLK 
//
//  Description; This program will toggle P5.1 by xor'ing P5.1 inside of
//  a basic timer ISR. ACLK used to clock basic timer. 
//  ACLK = LFXT1 = 32768, MCLK = SMCLK = DCO = 32xACLK = 1.048576MHz
//  //*An external watch crystal on XIN XOUT is required for ACLK*//	  
//
//		  MSP430FG439
//             -----------------
//         /|\|              XIN|-  
//          | |                 | 32kHz
//          --|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
  FLL_CTL0 |= XCAP14PF;                 // Configure load caps
  BTCTL = BTDIV + BT_fCLK2_DIV16;        // 125ms interrupt       
  P5DIR |= 0x02;                        // Set P5.1 to output direction

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

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