CCS/MSP430G2553: ADC Sequencing Issue

Part Number: MSP430G2553

Tool/software: Code Composer Studio

Hello,

I am unable to understand issue in my code and due to that I am not getting proper ADC count.

Hardware configuration:

1. MCU MSP430G2553 is running at 1MHZ.
2. A1,A2,A3 are ADC inputs (P1.1,P1.2, P1.3)
3. Applied 2.4VDC at A1 pin.
4. ADC reference voltage is same as supply voltage.

Code:

#include <msp430.h>
#include "main.h"
#include <stdint.h>

unsigned int ADC[10];

int main(void)
{
	// Clock-------------------------------------------------------------------------------
	WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
	  if (CALBC1_1MHZ==0xFF)		      // If calibration constant erased
	       {
	          while(1);                            // do not load, trap CPU!!
	       }
	DCOCTL = 0;
	BCSCTL1 = CALBC1_1MHZ;		// Set range
	DCOCTL = CALDCO_1MHZ;
	BCSCTL2 &= ~(DIVS_3);			// SMCLK = DCO = 1MHz


//ADC ------------------------------------------------------------------------------------

	ADC10CTL1 =INCH_3+CONSEQ_1 +ADC10SSEL_3;
	ADC10CTL0 =SREF_0 + ADC10SHT_0 + MSC+ ADC10ON + ADC10IE;
	ADC10AE0 |= 0x0E;                    
	ADC10DTC1 = 3;			                            // Three conversions.
	ADC10SA = ADC;                                      // ADC10 data transfer starting address.
	while (ADC10CTL1 & ADC10BUSY);              		// Wait if ADC10 core is active
	ADC10CTL0 |=ENC + ADC10SC;          				//start conversation
	
	while(1);
}


// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
	ADC10CTL0 &= ~ADC10IFG;       	 // clear interrupt flag
	ADC10SA = ADC;     				// ADC10 data transfer starting address.
	ADC10CTL0 |=ENC + ADC10SC;       //start conversation
}

Result:

ADC[0]=34 

ADC[1]=35

ADC[2]=167

Questions:

1. If I am applying 2.4volt then why I am not getting equivalent count 2.4*1023/3= 818? What is missing in my configuration? Please guide.

2. Will this ADC array store value in sequence for used channel only like ADC[0]= count for A1 channel, ADC[1]= count for A2 channel and so on? Or it will always start from A0 (even if I am not using)?

Please guide.

Thanks.