MSP430F2013 AD16 Voffset

I get readings and the more i use this AD16 converter the more i think i may need to go to a different one. i choose it for the 16bit AD converter, but in reality it is a 13bit AD converter. This is my last attempt at using this chip. i found it before but i cannot find it agian an answer to this question in the forums.

the fact the MSP430F2013 has a 1.2Vref maximum, actually 1.5Vmax according to datasheet, would be fine if that was a FSR. but we have to divide that by 2. so now i got a ±0.6Vdc around ZERO. 

The problem with the TSSOP 14P MSP430F2013 is there is no AVss, which is what i would assume i would use to offset. i have tried to use the differential input characteristics thinking if i put 0.6V on A0- pin that would than consider that as ZERO so then when A0+ sees 0.6V it would register as a 0x8000. however this is not the case. 

Due to my earlier questions and getting use to this forum here is the code per requests from various engineers.

/* SD16 setup channel 0, single conversion, internal 1.2Vref, High speed buffer, no interrupts, 256 xOSR */

#define SD16BUF_HS (0x6000)  // Bits 14-13 of SD16CCTL0
#define SD16XDIV16 (0x0400)  // Bits 11-9 of SD16CTL

int SD16_init(void){
     SD16CTL = (SD16XDIV16 + SD16REFON);
     SD16CCTL0 = (SD16BUF_HS + SD16SNGL);
     return 1;
}

int SD16_read_ch0(void){
     SD16CCTL0 |= SD16SC;
     while(!(SD16CCTL0 & SD16IFG));
     return (SD16MEM0 >> 3);
}

When i run this code, even though i have zero volts on A0+ i read 0x8000 and i still have a maximum of 0.6V input rather than what i was hoping was 0-1.2V with 0.6V as the zero. is there a way to setup the converter to read 0.6V as the zero marker to get a range of 0-1.2V instead of 0-0.6V

Edit: I also tested to see if maybe the fact i am using an internal Vref is causing a shift, for example, maybe A0- is tied to AVss. so if i put A0- to 0.6Vdc than AVss is 0.6Vdc so it just shifted everything up. so i change the system to have an external Vref of 1.2V and removed the SD16REFON in the code. This however did nothing different.

Edit: I found the earlier articles. this one is exactly what i am trying to do.

SD16 of MSP430F2013 - Clamp Voltage Problem

but every time i try and post link it creates a big image.

someone pointed out i was reading wrong document so i checked and removed the SD16BUF_HS line since the MSP430F2013 does not have a high speed buffer input option.

I am going to replace the chip maybe i broke it in all my testing