38.5.8 Register Access Protection

Registers with write access can be optionally write-protected by the Peripheral Access Controller (PAC), except for the following:

Device Interrupt Flag (INTFLAG) register
Endpoint Interrupt Flag (EPINTFLAG) register

Note: Optional write protection is indicated by the "PAC Write Protection" property in the register description.

When the CPU is halted in debug mode, all write protection is automatically disabled. Write protection does not apply for accesses through an external debugger.

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