As far as aerodynamical positive stability is concerned, all airbuses are very conventional aircraft.
For the flight path attentuation / augumentation function of the FBW (called normal law), in an upset it works like this (AP off):
- the disturbance causes a motion of the airframe around one or more of its axes
- the FCS senses that motion and compares it against the pilots’ input (stick/rudder displacement)
- a combination of control surfaces movement will be commanded so that the resulting motion mirrors the input on the controls and not the outside interference .
In simple terms: the FBW will stop an external protuberance, but then keep the A/C displaced from its initial state. It won’t come back without pilots steering.