Merkwürdige Überschwinger auf Sinus

#include  <msp430g2452.h>

int winkel=0;

const int sinus_a[]={25, 33, 40, 45, 49, 50, 49, 45, 40, 33,

          25, 17, 10, 5,  1, 0, 1, 5, 10, 17};

void main(void)

{

   WDTCTL = WDTPW + WDTHOLD;                // Stop watchdog timer

   DCOCTL = CALDCO_16MHZ;

   BCSCTL1 = RSEL3+RSEL2+RSEL1+RSEL0;

   BCSCTL2= 0;

  P1DIR = BIT2;                             

  P1SEL = BIT2;                             // timer output

  P1OUT = 0;                                // LED off

  CCTL0 = CCIE+OUTMOD_7  ;                  // CCR0 interrupt enabled

  CCTL1 = OUTMOD_7;

  TACTL = TASSEL_2 + MC_1;                  // SMCLK, up mode

  CCR0 = 50;

  CCR1 = 25;

  _BIS_SR(LPM0_bits + GIE);                 // Enter LPM0 w/ interrupt

}

// Timer A0 interrupt service routine

#pragma vector=TIMER0_A0_VECTOR

__interrupt void Timer_A (void)

{

  TACCR1 = sinus_a[winkel];

    winkel = (winkel+1)%20; // index für sinustabelle

}