RL78/G16 ADC counts not getting as expected

I am using RL78/G16 32pin micro, I have set the required fields for ADC counts,

As per  smart configurator in CS+ peripheral devices are set, but there is no option of setting internal reference voltage as 0.815volts hence I found that my ADC counts 774 value on 0volts.

Instead it should read 0 on 0volts.

Is it because reference is taken 4.9 or 5volts by default by the configurator or something else ?

As i am getting 1023 count value at 5volts.

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