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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

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