The bits adcX_cfg_1p1v[79:80] are common to all 5 ADC modules. Depending on the individual ADC (ADC0- ADC4) configuration (Single-ended or Differential) the module will behave according to following information.
ADC configured in Single-ended Mode:
Selection=00: Normal ADC o/p [+0.0V = code 0 and +3.2V = code 4095]
Selection=10: Reserved
Selection=11: Reserved
ADC configured in Differential Mode:
Selection=00: Normal ADC Output with a code differential offset of 64. The output code rolls over above input 3.2V.
(A 3.2V to 3.3V input voltage will result in the same output code as 0-100mV input voltage)