Casio PX-780 User Manual

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5-2. Power saving control
Thefollowingpowersavingfunctionsareprovidedwiththisdevice:
1Idlestate
 SavespowerbymakingtheCPUintheidlestatewhenthereisnoexecutableeventandthesystemand
applicationsarewaitingforanextevent.Peripheraldevicesareinoperation.
2CPUfrequencycontrol
 CPU frequency can be switched between the setting to handle high-speed processing and the power
saving setting. This setting can be changed by the system library and the CPU frequency of "LOW:
200MHz"or"HIGH:400MHz"canbeselected."LOW"forthenormalstateisthedefault.
3 APO (Automatic Power Off)
 Whenthereisnokeyinput(keysortouchpanel)forthespeciedperiod,thisfunctionautomaticallyturns
OFFthepowerofthesystem.AllowingorprohibitingtheAPOfunctionandsettingofthetimetoinvokethe
functioncanbechangedbythesoftware.
 Basicsettimeisspeciedbyusing"Powermanagement"onthecontrolpanel.
4 Dimmer control
 Whenthedeviceisbatteryoperatedandisleftwithoutanyinputbykeysortouchpanel(idlestate),the
backlightautomaticallybecomes"dimmer"tosavepower(automaticdimmerfunctiononlyworkswhenthe
deviceisbatteryoperated.Whenitisoperatedbyanexternalpowersource,thisfunctionisnotinvoked).
* Inputtingbykeysortouchpanelcancelstheautomaticdimmerfunctionandreturnsthebacklighttothe
normalbrightness.
* Settingofon/offoftheautomaticdimmerfunction(defaultsettingison),andthewaitingtimeuntilthe
automaticdimmerfunctionisinvokedcanbechangedby"Contrast&Brightness"onthecontrolpanel.
 ThebrightnessoftheLEDbacklightwhentheautomaticdimmerfunctionisoncanbechanged(default
settingisonthethirdstep).The settingoftheLED backlightwhentheautomatic dimmerfunctionison
cannotbebrighterthanthenormalbrightnesssettingwhenthedeviceisbatteryoperated.
5 ABO (Automatic Backlight Off)
 Whenthedeviceisturnedonandisleftwithoutanyinputbykeysortouchpanel(idlestate),thebacklight
automaticallyturns"off"tosavepower(automaticbacklightoffworkswhenthedeviceisbatteryoperated
andalsowhenitisoperatedbyanexternalpowersource).
* Inputting by keys or touch panel cancels the automatic backlight off and returns the backlight to the
normalbrightness.
* Setting of on/off of the automatic backlight off (default setting is on), and the waiting time until the
automaticbacklightoffisinvokedcanbechangedby"Contrast&Brightness"onthecontrolpanel.
 When the device is battery operated and both the above-mentioned automatic dimmer function and
automaticbacklightofffunctionareset,thesettingwhosewaitingtimeisshorterwillbevalid.
Example: Whentheautomaticdimmerfunctionissetat1minuteandtheautomaticbacklightofffunction
issetat5minutes.
g
After 1 minute, the automatic dimmer function is invoked, and 4 minutes thereafter, the
automaticbacklightoffisinvoked.
 Whentheautomaticdimmerfunctionissetat5minutesandtheautomaticbacklightofffunction
issetat1minute.
g
After1minute,onlytheautomaticbacklightofffunctionisinvoked(inthiscase,theautomatic
dimmerfunctionisnotinvoked).Ifthedeviceisunderthebrightlightsuchasundertheoutside
light,the brightsensordetectsthebrightnessand automatically turnsoffthebacklightofthe
screen.Thisreducesthepowerconsumptionwhenthedeviceisusedundertheoutsidelight.
* This automatic change function works when the intensity of the outside light reaches the certain
brightnesslevel.Thisfunctionworks at the brightness detected ata5-secondintervalwhichdoesnot
reacttorapidchanges.

Casio PX-780 Specifications

General

Brand	Casio
Model	PX-780
Category	Handhelds
Language	English