'Temperature sensor for Dragon12

I have a project on Dragon12-Plus and I have to use de temperature sensor. I found this function

void temp(unsigned int x) //input voltage to convert
{ 
    //ATD0CTL0,ATD0CTL1- reserved    
    ATD0CTL2 = 0xC0; //1100 0000 
    ATD0CTL3 = 0x08; 
    ATD0CTL4 = 0xEB; //1110 1011 
    ATD0CTL5 = 0xA4; //1010 0101 

    displayValue(x*500/255);
}

and the function has this call temp(ATD0DR0L); in main. Why the value has the form x*500/255 ? Can someone help me? Thanks!

sensorstemperature


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