24.4.4 Reset State Priorities

The reset state manager manages the following priorities between the different reset sources, given in descending order:

• Backup reset
• Wake-up reset
• Watchdog reset
• 32.768 kHz Crystal Oscillator Failure Detection reset
• Software reset
• User reset

Particular cases are listed below:

• When in user reset:
  • A watchdog event is impossible because the watchdog timer is being reset by the processor reset signal.
  • A software reset is impossible, since the processor reset is being activated.
• When in software reset:
  • A watchdog event has priority over the current state.
  • The NRST has no effect.
• When in watchdog reset:
  • The processor reset is active and so a software reset cannot be programmed.
  • A user reset cannot be entered.