text: /* --COPYRIGHT--,BSD_EX
   * Copyright (c) 2012, Texas Instruments Incorporated
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
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   *    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.
   *
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   *    its contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
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   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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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--*/
  //******************************************************************************
  //  MSP430G2xx3 Demo - Timer_A, Toggle P1.1/TA0, Up/Down Mode, 32kHz ACLK
  //
  //  Description: Toggle P1.1 using hardware TA0 output. Timer_A is configured
  //  for up/down mode with CCR0 defining period, TA0 also output on P1.1. In
  //  this example, CCR0 is loaded with 5 and TA0 will toggle P1.1 at TACLK/2*5.
  //  Thus the output frequency on P1.1 will be the TACLK/20. No CPU or software
  //  resources required. Normal operating mode is LPM3.
  //  ACLK = TACLK = 32kHz, MCLK = default DCO
  //  As coded with TACLK = ACLK, P1.1 output frequency = 32768/20 = 1.6384kHz
  //  //* External watch crystal installed on XIN XOUT is required for ACLK *//
  //
  //            MSP430G2xx3
  //         -----------------
  //     /|\|              XIN|-
  //      | |                 | 32 kHz
  //      --|RST          XOUT|-
  //        |                 |
  //        |         P1.1/TA0|--> ACLK/20
  //
  //  D. Dang
  //  Texas Instruments Inc.
  //  December 2010
  //   Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
  //******************************************************************************
  
  #include <msp430.h>
  
  
  int main(void)
  {
    WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
    P1DIR |= 0x02;                            // P1.1 output
    P1SEL |= 0x02;                            // P1.1 option select
    CCTL0 = OUTMOD_4;                         // CCR0 toggle mode
    CCR0 = 5;
    TACTL = TASSEL_1 + MC_3;                  // ACLK, up-downmode
  
    __bis_SR_register(LPM3_bits);             // Enter LPM3
  }
  