I can see following description at page.20 of the datasheet of AD5410/AD5420, however I can not see any more description what are they.
> Also upon power-on, internal calibration registers are read, and the data is applied to internal calibration circuitry.
I would like to know
a) Is data/value in these registers volatile or non-volatile ?
b) When and who write data/value into these register ?
Sorry to these fundamental questions, but please give your comments to confirm.