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+/* --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
+ * are met:
+ *
+ * *  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
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *******************************************************************************
+ * 
+ *                       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--*/
+//******************************************************************************
+//  MSP430F20xx Demo - Timer_A, Toggle P1.0-2, Cont. Mode ISR, DCO SMCLK
+//
+//  Description: Use Timer_A CCRx units and overflow to generate four
+//  independent timing intervals. For demonstration, CCR0 and CCR1 output
+//  units are optionally selected with port pins P1.1 and P1.2 in toggle
+//  mode. As such, these pins will toggle when respective CCRx registers match
+//  the TAR counter. Interrupts are also enabled with all CCRx units,
+//  software loads offset to next interval only - as long as the interval offset
+//  is aded to CCRx, toggle rate is generated in hardware. Timer_A overflow ISR
+//  is used to toggle P1.0 with software. Proper use of the TAIV interrupt
+//  vector generator is demonstrated.
+//  ACLK = n/a, MCLK = SMCLK = TACLK = default DCO ~1MHz
+//  As coded and assuming ~1MHz DCO, toggle rates are:
+//  P1.1 = CCR0 ~ 1MHz/(2*200) ~2500Hz
+//  P1.2 = CCR1 ~ 1MHz/(2*1000) ~500Hz
+//  P1.0 = overflow ~ 1MHz/(2*65536) ~8Hz
+//
+//               MSP430F20xx
+//            -----------------
+//        /|\|              XIN|-
+//         | |                 |
+//         --|RST          XOUT|-
+//           |                 |
+//           |         P1.1/TA0|--> CCR0
+//           |         P1.2/TA1|--> CCR1
+//           |             P1.0|--> Overflow/software
+//
+//  M. Buccini / L. Westlund
+//  Texas Instruments Inc.
+//  October 2005
+//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
+//******************************************************************************
+
+#include <msp430.h>
+
+int main(void)
+{
+  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
+  P1SEL |= 0x06;                            // P1.1 - P1.2 option select
+  P1DIR |= 0x07;                            // P1.0 - P1.2 outputs
+  CCTL0 = OUTMOD_4 + CCIE;                  // CCR0 toggle, interrupt enabled
+  CCTL1 = OUTMOD_4 + CCIE;                  // CCR1 toggle, interrupt enabled
+  TACTL = TASSEL_2 +  MC_2 + TAIE;          // SMCLK, Contmode, int enabled
+
+  __bis_SR_register(LPM0_bits + GIE);       // Enter LPM0 w/ interrupt
+}
+
+// Timer A0 interrupt service routine
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=TIMERA0_VECTOR
+__interrupt void Timer_A0 (void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(TIMERA0_VECTOR))) Timer_A0 (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  CCR0 += 200;                              // Add Offset to CCR0
+}
+
+// Timer_A2 Interrupt Vector (TAIV) handler
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=TIMERA1_VECTOR
+__interrupt void Timer_A1(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(TIMERA1_VECTOR))) Timer_A1 (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  switch( TAIV )
+  {
+  case  2: CCR1 += 1000;                    // Add Offset to CCR1
+           break;
+  case 10: P1OUT ^= 0x01;                   // Timer_A3 overflow
+           break;
+ }
+}
+