Code Verständisfrage

#include<msp430g2231.h>

void tempInit()

{

    ADC10CTL0=SREF_1 + REFON + ADC10ON + ADC10SHT_3 ; //1.5V ref,Ref on,64 clocks for sample

    ADC10CTL1=INCH_10+ ADC10DIV_3; //temp sensor is at 10 and clock/4

}

int tempOut()

{

    int t=0;

    __delay_cycles(1000);              //wait 4 ref to settle

    ADC10CTL0 |= ENC + ADC10SC;      //enable conversion and start conversion

    while(ADC10CTL1 & BUSY);         //wait..i am converting..pum..pum..

    t=ADC10MEM;                       //store val in t

    ADC10CTL0&=~ENC;                     //disable adc conv

    return(int) ((t * 27069L - 18169625L) >> 16); //convert and pass

}

void main(void)

{   volatile int temp;    //initialise

    WDTCTL = WDTPW + WDTHOLD; //stop..bow..boww

    temp=0;

    tempInit();//initialise adc

    while(1)

    {

        __delay_cycles(500); //wait and set break point

        temp=tempOut();           //read temp

        __delay_cycles(500);  //wait and set breakpoint

    }

}