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Adaptation/GUID-113B3755-1797-5D1B-8E07-8A18F5FE1504.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-113B3755-1797-5D1B-8E07-8A18F5FE1504" xml:lang="en"><title>Power States</title><shortdesc>Describes three power states that are defined by the kernel.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<ul>
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<li id="GUID-61A3C566-05AA-5F6D-A9DE-B409C873B119"><p> <i>Off</i> -
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a state where the device and all peripherals are powered off or inactive,
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or are characterised by negligible power consumption due to current
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leakage to the electric and electronic circuits that make up the system.
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This state is achieved as a result of controlled system shutdown resulting
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from a user action, an application request, UI inactivity, or as a
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result of accidental loss of power. This may also be achieved as a
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result of putting the system into a hibernation state. Note that a
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reboot is necessary to return the system to the <i>Active</i> state;
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this could be a cold reboot, or a warm reboot if the system was put
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into a hibernation state. </p> </li>
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<li id="GUID-275417B2-B8C8-5C93-B576-15543D80CAC9"><p> <i>Standby</i> - a low power consuming state that results from turning off most
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system resources (clocks, voltages), peripherals, memory banks (where
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possible), cpu and internal logic, while still retaining the state
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prior to the transition. Typically, the only systems that are active
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are those that are required to detect the events that force the transition
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back to the Active state (e.g. RTC, clocks and Peripherals involved
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in detecting hardware events). Returning to the Active state will
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normally take a far shorter period of time than that required to reboot
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the system. This state is achieved as a result of user action or application
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request. </p> </li>
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<li id="GUID-A31A5A3C-C7C2-5D15-88B2-828F7E5F60D8"><p> <i>Active</i> - the fully active state. </p> </li>
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</ul>
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<p>The three power states are defined by the enum values of the <xref href="GUID-87AB8B20-04EE-31D2-8F3D-EA904D05B8D0.dita"><apiname>TPowerState</apiname></xref> enum defined in <filepath>e32power.h</filepath>. </p>
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</conbody><related-links>
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<link href="GUID-E09E4418-4DC3-56A3-BFBE-486C9C8D25C9.dita"><linktext>Domain
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Manager</linktext></link>
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<link href="GUID-0C435514-EEC6-5660-BB5F-535790349632.dita"><linktext>Power
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Management</linktext></link>
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</related-links></concept>
FCL/sftools/depl/docscontent