Datasheet

70
SAM9M10 [DATASHEET]
6355FATARM12-Mar-13
When VDDBU is detected low by the Backup Supply POR Cell, all resets signals are immediately asserted, even if
the Main Supply POR Cell does not report a Main Supply shutdown.
VDDBU only activates the backup_nreset signal.
The backup_nreset must be released so that any other reset can be generated by VDDCORE (Main Supply POR
output).
Figure 12-4 shows how the General Reset affects the reset signals.
Figure 12-4. General Reset State
SLCK
periph_nreset
proc_nreset
Backup Supply
POR output
NRST
(nrst_out)
EXTERNAL RESET LENGTH
= 2 cycles
Startup Time
MCK
Processor Startup
= 3 cycles
backup_nreset
Any
Freq.
RSTTYP
XXX 0x0 = General Reset
XXX
Main Supply
POR output
BMS Sampling