Well there are lots of variations on this.
On the e-jets we have ATTCS, TO1 TO2 and sometimes TO3 depending on the engine.
The ATTCS system will in the event of an engine failure automatically cancel the flex and boost thrust to reserve for the rating selected.
VMC are based on TOx-RSV
Advancing the Thrust levers to MAX will never give more than TOx-RSV when you are engine out. But when both engines are running If you have chosen TO-3 the ATTCS will give you TO3-rsv if you have windshear warning but the pilot can push to max and get the equivalent of TO1-rsv.
It's all getting a bit out of hand don't you think?