can I set the lower reference and the highest reference of msp-exp430g2 adc?

Hi, I know that we can set the reference on 2.5,1.5 and 3.6V, but can we set the lowest reference looking to use the 1023 bits on read between 1.5V and 2.1V?

when 1.5V bit value=0x00 and 2.1V=1023.

Thanks and regards.