Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK データシート
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製品コード
AT91SAM9X25-EK
112
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
Figure 14-8. Watchdog Reset
14.4.5 Reset State Priorities
The Reset State Manager manages the following priorities between the different reset sources, given in descending
order:
order:
Backup Reset
Wake-up Reset
User Reset
Watchdog Reset
Software 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.
Only if
WDRPROC = 0
SLCK
periph_nreset
proc_nreset
wd_fault
NRST
(nrst_out)
EXTERNAL RESET LENGTH
8 cycles (ERSTL=2)
MCK
Processor Startup
= 3 cycles
Any
Freq.
RSTTYP
Any
XXX
0x2 = Watchdog Reset