13.25.5.8 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
- Host Interrupt Flag (INTFLAG) register
- Pipe Interrupt Flag (PINTFLAG) 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.