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Is it possible to input 1 V to AVss and 4 V to AVref, and convert 3 V at 256?

Latest Updated:04/01/2006

Question:

I understand that the voltage to be A/D converted must be between AVss and AVref, so is it possible to input 1 V to AVss and 4 V to AVref, and convert 3 V, which is between AVss and AVref, at a resolution of 256?

Answer:

No, this is not possible.
AVss must be the same potential as Vss.
AVss not only can be used as the reference potential for external analog input, but can also be used internally as the reference potential for the digital circuit interface.
It is therefore not possible to connect AVss and Vss to different potentials.
Suitable Products
RL78 Family
78K0/Kx2