ATTINY817-MFR. datasheet(71/492 Pages) MICROCHIP

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11.

SLPCTRL - Sleep Controller

11.1

Features

•

Three sleep modes:

–

Idle

–

Standby

–

Power Down

•

Configurable Standby sleep mode where peripherals can be configured as on or off.

•

SleepWalking in Standby sleep mode, where the PTC can start running on an Event without waking

up the device.

11.2

Overview

Sleep modes are used to shut down peripherals and clock domains in the device in order to save power.

The Sleep Controller (SLPCTRL) controls and handles the transitions between active mode and sleep

mode.

There are in total four modes available, one active mode in which software is executed, and three sleep

modes. The available sleep modes are: Idle, Standby and Power Down.

When the device enters a sleep mode, program execution is stopped, and depending on the entered

sleep mode, different peripherals and clock domains are turned off.

To enter a sleep mode, the SLPCTRL must be enabled and the desired sleep mode must be stated. The

software decides when to enter that sleep mode by using a dedicated sleep instruction (SLEEP).

Interrupts are used to wake up the device from sleep. The available Interrupt wake-up sources depend on

the configured sleep mode. When an interrupt occurs, the device will wake up and execute the interrupt

service routine before continuing normal program execution from the first instruction after the sleep

instruction. Any Reset will also take the device out of a sleep mode.

11.2.1

Block Diagram

Figure 11-1. Sleep Controller in System

SLPCTRL

Sleep instruction

Interrupt request

Peripheral

Interrupt request

Sleep state

CPU

11.2.2

System Dependencies

In order to use this peripheral, other parts of the system must be configured correctly, as described below.

ATtiny417/817

Datasheet Complete

DS40001901B-page 71

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