SAM3U datasheet(21/59 Pages) ATMEL

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6430ES–ATARM–22-Aug-11

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.

Notes:

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.

Table 5-1.

Low Power Mode Configuration Summary

Mode

SUPC,

32 kHz

Oscillator

RTC RTT

Backup

Registers,

POR

(VDDBU

Region)

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

(1)

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

Inputs with

pull ups

2.5 µA typ(4)

< 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 8 µA/15 µA (5) < 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 (6)

(6)

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