43.5.8 Register Access Protection

All registers with write-access are optionally write-protected by the Peripheral Access Controller (PAC), except the following registers:

Control B (CTRLB) register
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 chapter for details.

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