ECU charge Airbus

[AF330]

Hi!
I was learning the FADEC system (ECU, HMU, VSV, LPTCC...). But I learnt that the generator of the ECU had to be charged. So 2 questions:

1) Is it charger with DC? DC ESS? DC BAT? ...
2) Is the DC BAT charged? Or is it energy coming from DC 1 only?

Thanks