SAM3X datasheet(24/71 Pages) ATMEL

24 / 71 page

11057BS–ATARM–13-Jul-12

SAM3X/A

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

OFF

SHDN =0

OFF

(Not

powered)

WFE

+SLEEPDEEP

bit = 1

FWUP pin

WKUP0-15 pins

BOD alarm

RTC alarm

RTT alarm

Reset

state saved

PIOA &

PIOB &

PIOC &

PIOD &

PIOE &

PIOF

Inputs with

pull-ups

2.5 µA typ

(5)

< 0.5 ms

Wait

Mode

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

state saved

Unchanged 18.4 µA/26.6 µA

(6) < 10 µs

Sleep

Mode

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

state saved

Unchanged

(7)

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