Problme mit Clock für PWM (MSP430-F2013)

// working on a MSP430 F2013 (eZ430 Development Tool)

//----------------------------------------------------------------------

#include <io430x20x3.h>      // Specific device

#include <intrinsics.h>      // Intrinsic functions

#include <stdint.h>          // Integers of defined sizes

//----------------------------------------------------------------------

void main (void)

{

  WDTCTL = WDTPW | WDTHOLD;  // Stop watchdog timer

// Select clocks

  BCSCTL1 = CALBC1_8MHZ;       // Set range for calibrated DCO at 8MHz

  DCOCTL = CALDCO_8MHZ;        // Set DCO tap and modulation

        BCSCTL3 = LFXT1S_2;    // ACLK from VLO (12KHz)

        BCSCTL2 = DIVS_3;      // SMCLK = DCO/8 = 1Mhz

// Set up Timer_A for PWM on active high LED, channel 1

  TACCR0 = 200;                // should be 200us

  TACCR1 = 100;                // Duty cycle D = 0.5 initially (will be variable in the future)

  TACCTL0 = CCIE;              // Interrupts on compare to update PWM

  TACCTL1 = OUTMOD_7 | CCIE;   // Reset/set (positive PWM), interrupts

// Configure ports 1 and 2 with pull resistors on unused pins

  P1OUT = 0;                   // Preclear output buffer

  P1DIR = BIT0;                // Set P1.0 to output, others input

  P1REN = 0xFF & ~BIT0;        // Pull resistors on P1[7:1]

  P2SEL = 0;                   // Digital i/o rather than crystal

  P2REN = BIT6 | BIT7;         // Pull resistors on pins that exist

// Start timer from ACLK, no division, Up mode, clear, with interrupts

  TACTL = TASSEL_2 | ID_0 | MC_1 | TACLR | TAIE;

  for (;;) {                   // Loop forever

    __low_power_mode_3();      // Enter LPM3 between interrupts

  }

}

//----------------------------------------------------------------------

// Interrupt service routine for CCIFG1 and TAIFG; share vector

//----------------------------------------------------------------------

#pragma vector = TIMERA1_VECTOR

__interrupt void TIMERA1_ISR (void)  // ISR for CCIFG1 and TAIFG

{

  switch (__even_in_range(TAIV, 10)) {

  case 0:                      // No interrupt pending

    break;                     // No action

  case 2:                      // Vector 2: CCIFG1

    P1OUT_bit.P1OUT_0 = 0;     // End of duty cycle: Turn off LED

    break;

  case 10:                     // Vector A: TAIFG, last value possible

    P1OUT_bit.P1OUT_0 = 1;     // Start of PWM cycle: Turn on LED

    break;

  default:                     // Should not be possible

    for (;;) {                 // Loop here for ever

    }

  }

}