27.5.10.1 Security Bit Set Procedure

  1. Issue the Set Security Bit (SSB) command. If a debugger is connected, it still has access to the device after issuing this command (DSU STATUSB.PROT = 0).
  2. Check NVMNCTRL.INTFLAG.PROGE and NVMNCTRL.INTFLAG.DONE.
  3. Reset either the device or the NVMCTRL peripheral by issuing a SWRST command.
  4. After reset, DSU STATUSB.PROT = 1.