text: /* --COPYRIGHT--,BSD_EX
   * Copyright (c) 2012, Texas Instruments Incorporated
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
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   * *  Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * *  Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * *  Neither the name of Texas Instruments Incorporated nor the names of
   *    its contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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   * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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   *******************************************************************************
   * 
   *                       MSP430 CODE EXAMPLE DISCLAIMER
   *
   * MSP430 code examples are self-contained low-level programs that typically
   * demonstrate a single peripheral function or device feature in a highly
   * concise manner. For this the code may rely on the device's power-on default
   * register values and settings such as the clock configuration and care must
   * be taken when combining code from several examples to avoid potential side
   * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
   * for an API functional library-approach to peripheral configuration.
   *
   * --/COPYRIGHT--*/
  //******************************************************************************
  //  MSP430F543xA Demo - Timer_A3, Toggle P1.0, CCR0 Up Mode ISR, 32kHz ACLK
  //
  //  Description: Toggle P1.0 using software and the TA_1 ISR. Timer1_A is
  //  configured for up mode, thus the timer overflows when TAR counts
  //  to CCR0. In this example, CCR0 is loaded with 1000-1.
  //  Toggle rate = 32768/(2*1000) = 16.384
  //  ACLK = TACLK = 32768Hz, MCLK = SMCLK = default DCO ~1.045MHz
  //
  //           MSP430F5438A
  //         ---------------
  //     /|\|               |
  //      | |               |
  //      --|RST            |
  //        |               |
  //        |           P1.0|-->LED
  //
  //   M. Morales
  //   Texas Instruments Inc.
  //   June 2009
  //   Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.11B
  //******************************************************************************
  
  #include <msp430.h>
  
  int main(void)
  {
    WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
    P1DIR |= 0x01;                            // P1.0 output
    TA1CCTL0 = CCIE;                          // CCR0 interrupt enabled
    TA1CCR0 = 1000-1;
    TA1CTL = TASSEL_1 + MC_1 + TACLR;         // ACLK, upmode, clear TAR
  
    __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3, enable interrupts
    __no_operation();                         // For debugger
  }
  
  // Timer A0 interrupt service routine
  #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
  #pragma vector=TIMER1_A0_VECTOR
  __interrupt void TIMER1_A0_ISR(void)
  #elif defined(__GNUC__)
  void __attribute__ ((interrupt(TIMER1_A0_VECTOR))) TIMER1_A0_ISR (void)
  #else
  #error Compiler not supported!
  #endif
  {
    P1OUT ^= 0x01;                            // Toggle P1.0
  }
  
  