60.6.6 Operating Modes

The SECUMOD is supplied by the VBAT power supply. It is not possible to program the SECUMOD if VBAT is not present.

The SECUMOD is able to operate in two different modes:

When all supplies are present and can be monitored, the SECUMOD can be switched to Normal mode.
Otherwise, the SECUMOD must be in Backup mode.

Note: After a power-up reset, the SECUMOD is in Backup mode.

The mode is selected in SECUMOD_CR by setting either the NORMAL bit or the BACKUP bit.

Note: The user must set the BACKUP bit to enter Backup mode prior to shutting off the VDDCORE power supplies.

In both modes, the user can enable or disable a protection by writing in the corresponding Mode Protection register. See Activation or Deactivation of Protections for more information.