40.5.6 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.

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