23.5.5 Register Access Protection
All registers with write-access are optionally write-protected by the Peripheral Access Controller (PAC), except the following registers:
- Interrupt Flag Status and Clear (INTFLAG) register
Write-protection is denoted by the "PAC Write-Protection" property in the register description.
Write-protection does not apply to accesses through an external debugger. Refer to the Peripheral Access Controller (PAC) for details.