MSP430 Brown Out?

#include <msp430.h>

//FRAM Variabeln Definieren

#pragma SET_DATA_SECTION(".fram_vars")

long umdrehung;

//Positionszustände

char pos;

char pos1;

char pos2;

#pragma SET_DATA_SECTION()

volatile unsigned int i;

volatile unsigned int j;

volatile unsigned long temp = 0;

int main(void) {

  WDTCTL = WDTPW | WDTHOLD;    // Stop watchdog timer

////////////// Clockspeed auf 8Mhz

    CSCTL0_H = 0xA5;

    CSCTL1 |= DCOFSEL0 + DCOFSEL1;             // Set max. DCO setting

    CSCTL2 = SELA_3 + SELS_3 + SELM_3;        // set ACLK = MCLK = DCO

    CSCTL3 = DIVA_0 + DIVS_0 + DIVM_0;        // set all dividers

    // _delay_cycles(1); = 0.125us

///////////////// ADC Konfiguration

    // Configure ADC10 - Pulse sample mode; ADC10SC trigger

    ADC10CTL0 = ADC10SHT_2 + ADC10ON;         // 16 ADC10CLKs; ADC ON

    ADC10CTL1 = ADC10SHP + ADC10CONSEQ_0;     // s/w trig, single ch/conv

    ADC10CTL2 = ADC10RES;                     // 10-bit conversion results

    ADC10MCTL0 = ADC10SREF_1 + ADC10INCH_11;  // AVcc/2

    // Configure internal reference

    while(REFCTL0 & REFGENBUSY);              // If ref generator busy, WAIT

    REFCTL0 |= REFVSEL_0+REFON;               // Select internal ref = 1.5V

                                              // Internal Reference ON

    //__delay_cycles(400);                      // Delay for Ref to settle

//////////////    P3DIR |= 0x70;  // Pin 4, 5, 6 Als ausgang definieren

    P2DIR |= 0x07;  // Pin 2.0, 2.1, 2.2 Als ausgang definieren

    P1DIR |= 0x08;  // Pin 3.0 Als ausgang

    P1DIR &= 0x07 + ~BIT1 + ~BIT2 + ~BIT4; // P1.0 1.1 1.2  als eingang def

    P1DIR &= ~BIT4; // P1.0 1.1 1.2  als eingang def

    P4DIR &= ~BIT0; // P4.0 Als Reset eingang

//    P4REN |= BIT0;  //Interner Pullup aktivieren

    P1DIR |= BIT6;

    P1DIR |= BIT7;

//LED's

//    PJDIR |= 0xff;

//    PJOUT = 0;

// Slaveselect P2.2 auf 1 setzen

    P2OUT |= BIT2;

  while(1){

    P1OUT |= BIT3;  // IR Dioden aktivieren

    _delay_cycles(80); //10us wait

    pos = P1IN;  //Zustände in pos schreiben

    P1OUT &= ~BIT3;  // IR Dioden deaktivieren

    //PJOUT = P1IN;   // Zur Kontrolle

    ADC10CTL0 |= ADC10ENC + ADC10SC;        // Sampling and conversion start

      while (ADC10CTL1 & ADC10BUSY);          // ADC10BUSY?

      if (ADC10MEM0 > 0x2cc){                  // is ADC10MEM = A11 > 1.10V? = 2.2V     2CC = 2.1V

  //    Auswertung

        if(!(pos==pos1) && (!((pos&0x07)==0)))//eine veränderung hat stattgefunden und ein sensor aktiv

            {

              if(pos&BIT0 && pos1&BIT1 && pos2&BIT2)umdrehung++;

              if(pos&BIT2 && pos1&BIT1 && pos2&BIT0)umdrehung--;

              pos2=pos1;

              pos1=pos;

            }

            _delay_cycles(2);

            P1OUT |= BIT7;

            _delay_cycles(5);

            P1OUT &= ~BIT7;

            _delay_cycles(2);

      }else{

        _delay_cycles(2);

          P1OUT |= BIT6;

          _delay_cycles(5);

          P1OUT &= ~BIT6;

          _delay_cycles(2);

      }

///////////////////////////////////////////////// Send

  temp = umdrehung;

  P2OUT &= ~BIT2;  // Slave Aktivieren

  for(j=4; j>0; j--){

    for(i=8; i>0; i--){

    if(temp&0x80000000) P2OUT |= BIT1;

    else P2OUT &= ~BIT1;

    temp=temp<<1;

    _delay_cycles(5);

      P2OUT |= BIT0;  // CLK Setzen

      _delay_cycles(1);

      P2OUT &= ~BIT0; // CLK zurücksetzen

    }

    _delay_cycles(50); // Pause zwischen den 8Bit  Blöcken

  }

  P2OUT |= BIT2;  // Slave deaktivieren

  _delay_cycles(800); // 100us delay

  }

}