Datasheet
26
11057BS–ATARM–13-Jul-12
SAM3X/A
26
11057BS–ATARM–13-Jul-12
SAM3X/A
The processor can be awakened from an interrupt if WFI instruction of the Cortex M3 is used, or
from an event if the WFE instruction is used to enter this mode.
5.5.4 Low Power Mode Summary Table
The modes detailed above are the main low power modes. Each part can be set to on or off sep-
arately and wake-up sources can be individually configured. Table 5-1 below shows a summary
of the configurations of the low power modes.
Notes: 1. SUPC, 32 kHz Oscillator, RTC, RTT, Backup Registers, POR
2. The external loads on PIOs are not taken into account in the calculation.
3. BOD current consumption is not included.
4. When considering the wake-up time, the time required to start the PLL is not taken into account. Once started, the device
works with the 4/8/12 MHz Fast RC oscillator. The user has to add the PLL start-up time if it is needed in the system. The
wake-up time is defined as the time taken for wake-up until the first instruction is fetched
5. Current consumption on VDDBU.
6. 18.4 µA on VDDCORE, 26.6 µA for total current consumption (using internal voltage regulator).
7. Depends on MCK frequency. In this mode, the core is supplied and not clocked but some peripherals can be clocked.
Table 5-1. Low Power Mode Configuration Summary
Mode
VDDBU
Region
(1)
Regulator
Core
Memory
Peripherals Mode Entry
Potential Wake-up
Sources
Core at
Wake-up
PIO State
while in Low
Power Mode
PIO State
at Wake-up
Consumption
(2)
(3)
Wake-up
Time
(4)
Backup
Mode
ON
OFF
SHDN =0
OFF
(Not
powered)
WFE
+SLEEPDEEP
bit = 1
FWUP pin
WKUP0-15 pins
BOD alarm
RTC alarm
RTT alarm
Reset
Previous
state saved
PIOA &
PIOB &
PIOC &
PIOD &
PIOE &
PIOF
Inputs with
pull-ups
2.5 µA typ
(5)
< 0.5 ms
Wait
Mode
ON
ON
SHDN =1
Powered
(Not
clocked)
WFE
+SLEEPDEEP
bit = 0
+LPM bit = 1
Any Event from: Fast
startup through
WKUP0-15 pins
RTC alarm
RTT alarm
USB wake-up
Clocked
back
Previous
state saved
Unchanged 18.4 µA/26.6 µA
(6)
< 10 µs
Sleep
Mode
ON
ON
SHDN =1
Powered
(7)
(Not
clocked)
WFE or WFI
+SLEEPDEEP
bit = 0
+LPM bit = 0
Entry mode = WFI
Interrupt Only;
Entry mode = WFE
Any Enabled Interrupt
and/or Any Event from
Fast start-up through
WKUP0-15 pins
RTC alarm
RTT alarm
USB wake-up
Clocked
back
Previous
state saved
Unchanged
(7) (7)