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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.

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

1. SleepWalking Support in SAM MCUs

In Cortex-M0+ MCUs (AM D, SAM L and SAM C) and some of the Cortex-M4 MCUs (SAMD5x/

SAME5x), the SleepWalking feature is supported by many peripherals and these peripherals use the on-

demand clock principle of the clock sources.

In the SAMD20/ D21 MCUs, the following peripherals support the SleepWalking feature.

• Real-Time Counter (RTC)

• External Interrupt Controller (ETC)

• SERCOMs (USART, SPI, I2C)

• Timer/Counter (TC)

• Timer/Counter for Control Applications (TCC)

• Analog-to-Digital Converter (ADC)

• Analog Comparator (AC)

• Event System (EVSYS)

Note: All peripheral events do not support SleepWalking. Refer to the Event System sections of the

relevant data sheets to know which event of the peripherals will support SleepWalking.

During Low-Power mode, the peripheral clocks are stopped. The SleepWalking supported peripheral that

needs a clock will request it from the clock system (For example, Generic Clock Controller in Cortex-M0+

MCU).

In Cortex-M0+ MCUs, the following are the configurations and sequence of steps for an asynchronous

path:

1. The Event System must be configured to use the asynchronous path causing the peripheral to

request its clock asynchronously of the core clock.

2. The event generator triggers the event user which is based on the event system configuration.

3. The clock must be provided by the Generic Clock Generator, which is asynchronous from the MCU

clock. The Generic Clock Controller will receive the request and then determine which generic clock

generator is involved and which clock source needs to be awakened.

4. The clock source wakes up, enabling the generic clock generator and generic clock stages

successively, and delivers the generic clock to the peripheral.

5. The peripheral that is associated with the event user must be able to run in Standby mode.

For additional information about event system paths, refer to the product data sheets or Event System

Tech Brief, which is available for download at http://ww1.microchip.com/downloads/en/devicedoc/

90003170a.pdf.

In Cortex-M7 MCUs (SAM E70/ S70), a few peripherals, such as UART, TWI support SleepWalking;

however, in the SAMG5x family of MCUs, the UART, TWI, SPI and ADC all support the SleepWalking

features.

In Cortex-M7 MCUs, the following are the configurations and sequence of steps:

1. The corresponding SleepWalking Activity Status register is checked to ensure that the peripheral

has no activity in progress.

2. If the corresponding SleepWalking Activity Status register is set, SleepWalking must be disabled.

3. Asynchronous partial wakeup function of the peripheral is enabled.

4. The Event generator (UART) triggers to wake up the MCU from Wait mode.

TB3183

SleepWalking Support in SAM MCUs

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	ATSAME51J18A

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