That's correct FCeng84, the flight controls begin to transition from Ground Mode to Flight Mode as soon as the pitch attitude is greater than 8 degrees after lift-off. The pitch controls transition to Flight Mode over a period of 5 seconds, while the lateral controls transition over a period of 0.5 seconds.
AF330:
2) Sorry, but I still don't understand how spoilers can extend on ground as you don't have roll rate demand....You are in direct link with ailerons/ elevators and mechanical link with rudder's.
The sidestick commands the ailerons AND the spoilers to move, both in the air and on the ground; however, the relationship between the sidestick position and control surface movement changes.
On the ground (ie Ground Mode), there is a 'direct' relationship between the sidestick deflection and the aileron/spoiler deflection, modified for speed. That is, a given amount of sidestick deflection will cause a given amount of aileron/spoiler deflection at a given speed. As the aircraft's speed increases during take-off, the amount of aileron/spoiler deflection for a given sidestick position will reduce. That way, the pilot is able to maintain wings level with a fixed sidestick position throughout the take-off roll, instead of having to reduce the input as the speed increases, as you would with a conventional aircraft. The Airbus training manuals recommend against using large control inputs to avoid excessive spoiler deployment.
Once airborne (ie Flight Mode), the sidestick position commands a roll rate that is proportional to the sidestick deflection (ie a roll demand).