4.5.4.3 Reset State Priorities

The reset state manager manages the priorities among the different reset sources. The resets are listed in order of priority as follows:

1. General reset
2. Backup reset
3. 32.768 kHz Crystal Failure Detection reset
4. Main System Bus Clock (MCK0) Failure Detection reset
5. Watchdog reset
6. Software reset
7. User reset

Specific cases are listed below:

• When in User reset:
  • A watchdog event is impossible because the WDT 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.