Fabien,
If there was a register like what you are requesting, it would be in the device datasheet or in the errata document. We generally do not have such a register on devices of this generation. Some of our latest devices may have started including this (you and others have been requesting this for many years), but that would not be back-filled to the C6713B.
Interestingly, I do not see A300 listed in the datasheet. Not sure what that means in this case.
Regards,
RandyP