#include <msp430x12x2.h>
#define TEM_ADC_CHL 0x0a
void InitSys(void);
void Read_ADC(unsigned int INCH_channel);
void ADC_TO_TEM(void);
unsigned int ADC_sample_val;
unsigned int long temp1,temp2;
unsigned int long IntDegC;
unsigned int long IntDegF;
void main(void)
{
    InitSys();
        while(1)
    {
        Read_ADC(TEM_ADC_CHL);
        ADC_TO_TEM();
    }          
}
void InitSys(void)
{
    // INIT SYSTEM CLKS(ACLK AND DCO/MCLK)
    WDTCTL  = WDTPW+WDTHOLD;         //關閉看門狗 
   
    BCSCTL1 = 0x87;                  //ACLK 分頻系數是1，內部電阻選7
    DCOCTL = 0xe0;                     //設置DCO輸出時鐘頻率5MHZ
    BCSCTL2 = SELM_0;                //選擇MCLK為DCOCLK，內部電阻
    ADC10CTL1 |= 0x08;               // 轉換時鐘為ACLK
    ADC10CTL0 = SREF_1 + ADC10SHT_0 + REFOUT + REFON + ADC10ON;
                                       //選擇內部電壓1.5V，采樣時間4XADC10CLKS
}
void Read_ADC(unsigned int INCH_channel)
{
    unsigned int tmp;
    ADC10CTL0 &= ~ENC;               
    tmp = ADC10CTL1;
    tmp &= 0x0fff;
    tmp |= (INCH_channel<<12);
    ADC10CTL1 = tmp;
    ADC10CTL0 |= ENC + ADC10SC;
  
    while(ADC10CTL1 & ADC10BUSY)
    {}
    ADC_sample_val = ADC10MEM;
    ADC10CTL0 &= ~ENC;               
}
void ADC_TO_TEM(void)
{
     
    //oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = A10*423/1024 - 278
    temp1 = ADC10MEM;
    IntDegC = ((temp1 - 673) * 423) / 1024;
    
    // oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = x*761/1024 - 468 
    temp2 = ADC10MEM; 
    IntDegF = ((temp2 - 630) * 761) / 1024; 
}


參考鏈接：http://www.picavr.com/news/2008-03/4481.htm