Microchip ATSAME51J20A Manual

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TB3183
What is SleepWalking? How it Helps to Reduce Power
Consumption
Introduction
The SleepWalking feature is available in ARM® Cortex®-based Microchip's microcontrollers (MCUs). This
feature allows temporary and asynchronous wake up of a peripheral to perform a task without waking up
the CPU from Standby mode.
In MCU operation, the internal timer wakes up the CPU to check if certain conditions have occurred (i.e.,
battery voltage monitoring using the ADC), or the peripheral interrupts have woke up the CPU. The CPU
and RAM traditionally consume the majority of the power in Active mode. Therefore, waking up the CPU
from Low-Power mode to check for these conditions and start relevant actions in an Active state will
consume a lot of power.
SleepWalking allows the CPU to remain in Low-Power mode until a relevant event occurs. When the CPU
is in Low-Power mode, that is, Standby mode in Cortex-M0+ MCU, the peripheral can request the clock to
perform its task. The CPU no longer needs to check whether or not a specific condition is present, such
as an address match condition on the I2C interface or a sensor connected to an ADC that has exceeded
a specific threshold. With SleepWalking, this is done entirely by the peripherals with the help of an event
system.
The following are basic implementation steps of SleepWalking:
• Main clocks and peripheral clocks are stopped in Sleep mode to save power
• Peripherals supporting SleepWalking (For example, peripherals supporting on-demand feature in
Cortex-M0+ MCUs) individually request clocks in Sleep mode
• Clocks remain active until a specific peripheral operation is complete
The CPU and RAM will not wake up when sleepwalking supported peripherals perform the tasks, unless
the CPU needs to perform an operation.
© 2018 Microchip Technology Inc. DS90003183A-page 1
Table of Contents
Introduction......................................................................................................................1
1. SleepWalking Support in SAM MCUs........................................................................3
2. Sleepwalking Implementation ...................................................................................5
3. Relevant Resources.................................................................................................. 8
The Microchip Web Site.................................................................................................. 9
Customer Change Notification Service............................................................................9
Customer Support........................................................................................................... 9
Microchip Devices Code Protection Feature................................................................... 9
Legal Notice...................................................................................................................10
Trademarks................................................................................................................... 10
Quality Management System Certified by DNV.............................................................11
Worldwide Sales and Service........................................................................................12
TB3183
© 2018 Microchip Technology Inc. DS90003183A-page 2

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: ATSAME51J20A

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