SAM4S 查看數據表（PDF） - Atmel Corporation

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SAM4S

AT91SAM ARM-based Flash MCU

Atmel Corporation 

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.

Table 5-1. Low-power Mode Configuration Summary

Mode

SUPC,

32 kHz Osc,

RTC, RTT

Backup

Registers,

POR

(Backup

Core

Memory

Region) 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

(1) (2)

Time(3)

Backup

Mode

ON

OFF

OFF VROFF bit = 1

(Not

powered)

+SLEEPDEEP

bit = 1

WUP0-15 pins

SM alarm

RTC alarm

RTT alarm

Reset

Previous

state saved

PIOA &

PIOB &

PIOC

Inputs with

pull ups

1 µA typ(4)

300 ms

Wait

Mode

w/Flash

in

ON

Standby

mode

ON

WAITMODE bit

=1

Powered

(Not clocked)

+SLEEPDEEP

bit = 0

+LPM bit = 1

FLPM0 bit = 0

FLPM1 bit = 0

Any Event from:

Fast startup through

WUP0-15 pins

Clocked

RTC alarm

back

RTT alarm

USB wake-up

Previous

state saved

Unchanged 32.2 µA(5)

< 10 µs

Wait

Mode

w/Flash

in Deep

ON

Power

Down

mode

ON

WAITMODE bit

=1

Powered

(Not clocked)

+SLEEPDEEP

bit = 0

+LPM bit = 1

FLPM0 bit = 0

FLPM1 bit = 1

Any Event from:

Fast startup through

WUP0-15 pins

Clocked

RTC alarm

back

RTT alarm

USB wake-up

Previous

state saved

Unchanged 27.6 µA

< 10µs

Entry mode =WFI

Interrupt Only;

Any Enabled

WFI

Interrupt and/or Any

Sleep

Mode

ON

ON

Powered(6) +SLEEPDEEP Event from: Fast

(Not clocked) bit = 0

start-up through

Clocked

back

Previous

state saved

Unchanged (7)

(7)

+LPM bit = 0

WUP0-15 pins

RTC alarm

RTT alarm

USB wake-up

Notes: 1. The external loads on PIOs are not taken into account in the calculation.

2. Supply Monitor current consumption is not included.

23

11100BS–ATARM–31-Jul-12

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