SAM3U Datasheet, PDF (21/59 Pages) ATMEL Corporation – AT91SAM ARM-based Flash MCU

SAM3U Series
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.
Table 5-1. Low Power Mode Configuration Summary
Mode
SUPC,
32 kHz
Oscillator
RTC RTT
Backup
Registers,
POR
(VDDBU
Region)
Core
Memory
Regulator Peripherals
Mode Entry
PIO State
Potential Wake Up Core at while in Low PIO State Consumption Wake-up
Sources
Wake Up Power Mode at Wake Up
(2) (3)
Time⁽¹⁾
Backup
Mode
FWUP pin
PIOA &
ON
OFF
OFF
WFE
WKUP0-15 pins
SHDN =0
(Not powered)
+SLEEPDEEP
bit = 1
BOD alarm
RTC alarm
Reset
Previous
state saved
PIOB &
PIOC
2.5 µA typ⁽⁴⁾
Inputs with
< 0.5 ms
RTT alarm
pull ups
Wait
Mode
Any Event from: Fast
WFE
startup through
ON
ON
Powered _{+SLEEPDEEP WKUP0-15 pins}
SHDN =1 (Not clocked)
bit = 0
RTC alarm
Clocked
back
Previous
state saved
Unchanged 8 µA/15 µA ⁽⁵⁾ < 10 µs
+LPM bit = 1 ^{RTT alarm}
USB wake-up
Sleep
Mode
Notes:
Entry mode =WFI
Interrupt Only; Entry
mode =WFE Any
WFE or WFI ^{Enabled Interrupt}
ON
ON
SHDN =1
Powered⁽⁷⁾
(Not clocked)
+SLEEPDEEP
bit = 0
and/or Any Event
from: Fast start-up
through WKUP0-15
Clocked
back
Previous
state saved
Unchanged ⁽⁶⁾
(6)
+LPM bit = 0 _pins
RTC alarm
RTT alarm
USB wake-up
1. When considering 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.
2. The external loads on PIOs are not taken into account in the calculation.
3. BOD current consumption is not included.
4. Current consumption on VDDBU.
5. 8 µA total current consumption - without using internal voltage regulator.
15 µA total current consumption - using internal voltage regulator.
6. Depends on MCK frequency.
7. In this mode the core is supplied and not clocked but some peripherals can be clocked.
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6430ES–ATARM–22-Aug-11