Compiler/MSP430I2041: About the msp430i2041 SD24 sampling problem.

Tool/software: TI C/C++ Compiler

Hello!

Now I am debugging the msp430i2041 SD24.There are several problems need ask you.

1.According to the data manual,The internal reference voltage is 1.2V,and the MCU VREF connect with 0.1uF capacitance to GND.But my software test ,When the voltage exceeds 0.6V,the AD value is 32767,Why did this happen?Shouldn't the detection voltage be 1.2V?

2.The detected voltage is over 1.2V,so I want to choose external reference voltage 3.0V,.the MCU VREF connect with 3.0V,But the same thing happens.Please help me .

Test sotfware:

unsigned long int results; // SD24 Conversion Results

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

//SD24CTL = SD24REFS; // Internal ref

SD24CCTL3 |= SD24SNGL |SD24DF; // Single sample, 2's complement

__delay_cycles(3200); // Delay ~200us for 1.2V ref to settle

while(1)
{
SD24CCTL3 |= SD24SC; // Set bit to start conversion
while(!(SD24CCTL3 & SD24IFG)); // Poll IFG until conversion completes
results = SD24MEM3; // Save SD24 conversion results
__no_operation(); // SET BREAKPOINT HERE
}
}

Thanks you!