RL78 Maximum analog input voltage to Sigma-Delta ADC

In RL78 datasheet it is mentioned that Sigma-Delta ADC reference is 0.8 V.

Also mentioned the maximum analog input voltage that can be given.

According to my theoretical knowledge maximum input voltage to ADC can be ADC reference voltage. If you see the snap above it shows that maximum voltage after Gain will be 0.5.
Why is this?
Please Correct any there is any mistake.   

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