AT91SAM datasheet(23/67 Pages) ATMEL

23 / 67 page

11100BS–ATARM–31-Jul-12

SAM4S Series [Preliminary]

5.5.3

Sleep Mode

The purpose of sleep mode is to optimize power consumption of the device versus response

time. In this mode, only the core clock is stopped. The peripheral clocks can be enabled. The

current consumption in this mode is application dependent.

This mode is entered via Wait for Interrupt (WFI) instructions with LPM = 0 in PMC_FSMR.

The processor can be awakened from an interrupt if WFI instruction of the Cortex-M4 is used.

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. The external loads on PIOs are not taken into account in the calculation.

2. Supply Monitor current consumption is not included.

Table 5-1.

Low-power Mode Configuration Summary

Mode

SUPC,

32 kHz Osc,

RTC, RTT

Backup

Registers,

POR

(Backup

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

(1) (2)

Wake-up

Time(3)

Backup

Mode

OFF

(Not powered)

VROFF bit = 1

+SLEEPDEEP

bit = 1

WUP0-15 pins

SM alarm

RTC alarm

RTT alarm

Reset

state saved

PIOA &

PIOB &

PIOC

Inputs with

pull ups

1 µA typ

(4)

300 ms

Wait

Mode

w/Flash

Standby

mode

Powered

(Not clocked)

WAITMODE bit

+SLEEPDEEP

bit = 0

+LPM bit = 1

FLPM0 bit = 0

FLPM1 bit = 0

Any Event from:

Fast startup through

WUP0-15 pins

RTC alarm

RTT alarm

USB wake-up

Clocked

back

state saved

Unchanged 32.2 µA

(5)

< 10 µs

Wait

Mode

w/Flash

in Deep

Power

Down

mode

Powered

(Not clocked)

WAITMODE bit

+SLEEPDEEP

bit = 0

+LPM bit = 1

FLPM0 bit = 0

FLPM1 bit = 1

Any Event from:

Fast startup through

WUP0-15 pins

RTC alarm

RTT alarm

USB wake-up

Clocked

back

state saved

Unchanged 27.6 µA

< 10µs

Sleep

Mode

Powered

(6)

(Not clocked)

WFI

+SLEEPDEEP

bit = 0

+LPM bit = 0

Entry mode =WFI

Interrupt Only;

Any Enabled

Interrupt and/or Any

Event from: Fast

start-up through

WUP0-15 pins

RTC alarm

RTT alarm

USB wake-up

Clocked

back

state saved

Unchanged

(7)

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