4.2.2 Device Configuration after a Wake-Up from Backup Mode

Before entering Backup mode, the backup area must be configured for the device to be able to wake up from an event (internal or external) as long as VBAT or VDD3V3 is supplied.

After wake-up, the device configuration is the following:

• Configuration of the peripherals the backup area remains the same as before entering Backup mode
• Main Clock (MAINCK) source is set to the 12 MHz internal RC Oscillator
• 12–48 MHz crystal oscillator and PLLs are disabled
• VDDCORE Supply Monitor and Core Reset are enabled
• Flash Wait State (FWS) bit in the Flash Mode register (EEFC_FMR) is set to 15 (0xF)
• Subsystem 1 is in Reset state and not clocked