Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

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SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The Reset State Manager manages the following priorities between the different reset sources, given in descend-
ing order:

• Backup Reset

• Wake-up Reset

• Watchdog 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 proc_nreset 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.