Access protection
The I-Flash module has one level of access protection (access to data both in Reading and
Writing): if bit ACCP of FNVAPR0 is programmed at 0, the I-Flash module becomes access
protected: data in the I-Flash module can be read only if the current execution is from the IFlash
module itself.
Protection can be permanently disabled by programming bit PDS0 of FNVAPR1H, in order
to analyze rejects. Protection can be permanently enabled again by programming bit PEN0
of FNVAPR1L. The action to disable and enable again Access Protections in a permanent
way can be executed a maximum of 16 times.
Trying to write into the access protected Flash from internal RAM or external memories will
be unsuccessful. Trying to read into the access protected Flash from internal RAM or
external memories will output a dummy data (software trap 0x009Bh).
