All PAC registers can only be accessed
in the secure alias, with the following exceptions:
- Write Control (WRCTRL) register
is also accessible in the Non-Secure Alias, but only for write protection
requests on non-secured peripherals.
- Peripheral Write Protection
Status (STATUSn) registers are also accessible in the Non-Secure Alias, but they
will only report information on non-secured peripherals.
Note: Refer to the Mix-Secure Peripherals section in the SAM
L11 Security Features chapter
for more information.