SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 231

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

Figure 13-6. Watchdog Reset
13.4.5
13.4.6
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
WDRPROC = 0
Reset State Priorities
Reset Controller Status Register
Only if
periph_nreset
proc_nreset
The Reset State Manager manages the following priorities between the different reset sources,
given in descending order:
Particular cases are listed below:
The Reset Controller status register (RSTC_SR) provides several status fields:
(nrst_out)
• General Reset
• Backup Reset
• Watchdog Reset
• Software Reset
• User Reset
• When in User Reset:
• When in Software Reset:
• When in Watchdog Reset:
• RSTTYP field: This field gives the type of the last reset, as explained in previous sections.
RSTTYP
wd_fault
NRST
SLCK
MCK
– A watchdog event is impossible because the Watchdog Timer is being reset by the
– A software reset is impossible, since the processor reset is being activated.
– A watchdog event has priority over the current state.
– The NRST has no effect.
– The processor reset is active and so a Software Reset cannot be programmed.
– A User Reset cannot be entered.
proc_nreset signal.
Freq.
Any
Any
Processor Startup
= 2 cycles
XXX
EXTERNAL RESET LENGTH
8 cycles (ERSTL=2)
0x2 = Watchdog Reset
SAM3X/A
SAM3X/A
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