MSP430L092: TEMPERATURE SENSOR MEASURING ERROR

I want to measure internal temperature sensor value. I used example code that is msp430x09x_apool_adc_06.c  (APOOL_ADC, Sampled Temperature and Convert to oC)  but it does not work properly.  I observed that APINT (A-POOL Integer Conversion Value Register) value is just increasing second by second. I have tried to debug with IAR Embedded Workbench via MSP-FET FLASH EMULATION TOOL and MSP-TS430L092 Target Board. Please help me to sort this kind of problem. I tried to turn on P1.4 pin that is tied LED with temperature sensor value. If the DegC value is between 15 and 30, it will turn on LED otherwise it doesn't work. I saw that my LED turn on after 20 seconds. First it blinked three times and then it permanently turns on until 40 seconds. Finally it turns off dramatically because my APINT  value is just increasing. Why does it work? Can someone help me please?

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/* Description: ADC Temperature Sample */
/****************************A_POOL ADC Conversion *******************************/
/* */
/* */
/* +----L092---+ */
/* |*1 14 | */
/* | 2 13 | */
/* | 3 12 | */
/* | 4 11 | */
/* | 5 10 | */
/* | 6 9 | */
/* | 7 8 | */
/* +-----------+ */
/* */
/* D.Dang/ D.Archbold/ D.Szmulewicz /F. Chen */
/* Texas Instruments Inc. */
/* Built with IAR Version 5.51.1 and CCS Verison 5.3.00090 */
/*********************************************************************************/

#include <msp430.h>

int Result;
volatile short int DegC;

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT

// Begin Configuration of the A-POOL registers

APCTL = 0; // Clear APCTL register
APIE |= EOCIE; // Enable Interrupt for End of Conversion
APTRIM = REFTSEL;
APVDIV = TMPSEN; // Enable Temperature Sensor
APCNF = CMPON+DBON+CONVON+APREFON+CLKSEL_MCLK; // Configure A-POOL elements, Select MCLK as A-POOL Clock Source

P1DIR |= BIT0 + BIT1 + BIT4;

while(1)
{

APCTL = OSEL+ODEN+OSWP+APPSEL_4+APNSEL_5; // Set Channels and Start Conversion--+ODEN+
APINT = 0x00; // Clear ADC-DAC-REG
APIFG = 0;
APCTL |= CBSTP+SBSTP+RUNSTOP;
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts enabled

Result = APINT;
DegC =(((Result-179)*125)/58) + 30; // Refer to datasheet for accuracy and offset specs

if(DegC>15&&DegC<30){
P1OUT|=BIT4;
}

else{
P1OUT&=~BIT4;
}
__no_operation(); // SET BREAKPOINT HERE

}

}

//A_POOL Interrupt Service Routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=APOOL_VECTOR
__interrupt void A_POOL(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(APOOL_VECTOR))) A_POOL (void)
#else
#error Compiler not supported!
#endif
{
APIFG = 0; // Clear Interrupt Flag
__bic_SR_register_on_exit(LPM0_bits); // Exit Active to calculate Temperature

}