Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet

42023ES–SAM–07/2013

The ATSAM4L8/L4/L2 supports multiple power configurations to allow the user to optimize its
power consumption in different use cases. The Backup Power Manager (BPM) implements dif-
ferent solutions to reduce the power consumption:

• The Power Save modes intended to reduce the logic activity and to adapt the power 

configuration. See 

• The Power Scaling intended to scale the power configuration (voltage scaling of the 

regulator). See 

These two techniques can be combined together.

Power Scaling and Power Save Mode Overview

Refer to 

 to get definition of the core

and the backup domains.

SLEEP1

WAIT1

RET1

BKUP1

RUN1

  POWER SCALING  

Max frequency = 36Mhz

Normal Speed Flash

Nominal Voltage

BPM.PMCON.PS=0

Max frequency = 12Mhz

Normal Speed Flash

Reduced Voltage

BPM.PMCON.PS=1

RESET

SLEEP0

WAIT0

RET0

BKUP0

RUN0

CPU Clock OFF

4 sub-modes

All Clocks OFF

SleepWalking

All Clocks OFF

Full chip retention

Core Domain OFF

  P

O

WE
R

 SA
VE
 M

O

DE
S 

 

Max frequency = 48Mhz

High Speed Flash

Nominal Voltage

BPM.PMCON.PS=2

SLEEP2

WAIT2

RET2

BKUP2

RUN2