SAM4L Datasheet, PDF (47/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
6. Low Power Techniques
The ATSAM4L4/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 ”Power Save Modes” on page 47.
• The Power Scaling intended to scale the power configuration (voltage scaling of the
regulator). See ”Power Scaling” on page 52.
These two techniques can be combined together.
Figure 6-1. Power Scaling and Power Save Mode Overview
RESET
Max frequency = 36Mhz
Normal Speed Flash
Nominal Voltage
BPM.PMCON.PS=0
POWER SCALING
Max frequency = 12Mhz Max frequency = 48Mhz
Normal Speed Flash High Speed Flash
Reduced Voltage
Nominal Voltage
BPM.PMCON.PS=1 BPM.PMCON.PS=2
RUN
RUN0
RUN1
RUN2
SLEEP
CPU Clock OFF
4 sub-modes
WAIT
All Clocks OFF
SleepWalking
RETENTION
All Clocks OFF
Full chip retention
SLEEP0
WAIT0
RET0
BACKUP
Core Domain OFF
BKUP0
SLEEP1
WAIT1
RET1
BKUP1
SLEEP2
WAIT2
RET2
BKUP2
6.1 Power Save Modes
Refer to Section 5. ”Power and Startup Considerations” on page 38 to get definition of the core
and the backup domains.
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