30.5.8 Register Access Protection

All registers with write access can be write protected optionally by the PAC, except the following registers:

Control B register (CTRLB)
Interrupt Flag Status and Clear register (INTFLAG)
Status register (STATUS)

Optional write protection by the PAC is denoted by the PAC Write-Protection property in each individual register description.

Write protection does not apply to accesses through an external debugger.

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