SAM4L Datasheet, PDF (133/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
11. Backup Power Manager (BPM)
Rev: 1.2.0.5
11.1 Features
• Supports the Power Scaling Technique
• Controls the Power Save Modes
• Manages I/O lines pin muxing for Backup mode
• Manages I/O lines retention in Backup mode
• Stores the wake up source from Backup mode
11.2 Overview
The Backup Power Manager (BPM) located in the Backup domain is an extension of the Power
Manager (PM) module.
To optimize power consumption, the BPM supports the Power Scaling Technique. The BPM
allows changing the Power Scaling configuration in both RUN and Power Save Mode.
The BPM allows the user to choose between different Power Save Modes depending on appli-
cation requirements. It controls the way the microcontroller enters or exits a Power Save Mode.
In BACKUP mode, some I/O lines are dedicated to system wakeup. The BPM takes control of
these I/O line pins muxing needed to wake up the system.
The configuration of the I/O lines is kept in all Power Save Modes. Exiting the BACKUP mode
will reset the Core domain and by default will put the I/O lines in their reset state. The BPM
allows retaining the I/O line state when exiting the BACKUP mode, preventing I/O lines from tog-
gling during wake up.
The BPM flags the wake up source when the BACKUP mode is exited.
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