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HT45R4U датащи(PDF) 79 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 79 Page - Holtek Semiconductor Inc |
79 / 105 page Rev. 1.10 78 �a��� 1�� �01� Rev. 1.10 79 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Fast Wake-up TominimisepowerconsumptionthedevicecanentertheSLEEPorIDLE0Mode,wherethesystem clocksourcetothedevicewillbestopped.Howeverwhenthedeviceiswokenupagain,itcantake aconsiderabletimefortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperation toresume.ToensurethedeviceisupandrunningasfastaspossibleaFastWake-upfunctionis provided,whichallowsfSUB,namelytheLXToscillator,toactasatemporaryclocktofirstdrive thesystemuntiltheoriginalsystemoscillatorhasstabilised.AstheclocksourcefortheFastWake- upfunctionisfSUB,theFastWake-upfunctionisonlyavailableintheSLEEP1andIDLE0modes. WhenthedeviceiswokenupfromtheSLEEP0mode,theFastWake-upfunctionhasnoeffect becausethefSUBclockisstopped.TheFastWake-upenable/disablefunctioniscontrolledusingthe FSTENbitintheSMODregister. IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLXToscillatorforthesystem towake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024HXTclock cycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwillswitchoverto operatingfromtheHXToscillator. IftheHIRCoscillatorisusedasthesystemoscillatorthenitwilltake15~16clockcyclesofthe HIRCtowakeupthesystemfromtheSLEEPorIDLE0Mode.TheFastWake-upbit,FSTENwill havenoeffectinthiscase. System Oscillator FSTEN Bit Wake-up Time (SLEEP0 Mode) Wake-up Time (SLEEP1 Mode) Wake-up Time (IDLE0 Mode) Wake-up Time (IDLE1 Mode) HXT 0 10�4 HXT �y�les 10�4 HXT �y�les 1~� HXT �y�les 1 10�4 HXT �y�les 1~� fSUB �y�les (System �uns wit� fSUB first for 1024 HXT cycles and then swit��es ove� to �un wit� t�e HXT �lo�k ) 1~� HXT �y�les HIRC x 1�~16 HIRC �y�les 1�~16 HIRC �y�les 1~� HIRC �y�les LXT x 10�4 LXT �y�les 10�4 LXT �y�les 1~� LXT �y�les Wake-up Times NotethatiftheWatchdogTimerisdisabled,whichmeansthatthefSUBclockderivedfromtheLXT isoff,thentherewillbenoFastWake-upfunctionavailablewhenthedevicewakesupfromthe SLEEP0Mode. Operating Mode Switching Thedevicecanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating currentandprolongingbatterylifeinportableapplications. Insimpleterms,ModeSwitchingbetweentheNORMALModeandSLOWModeisexecuted usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromthe NORMAL/SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.When aHALTinstructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeis determinedbytheconditionoftheIDLENbitintheSMODregisterandFSYSONintheSMOD1 register. WhentheHLCLKbitswitchestoalowlevel,whichimpliesthatclocksourceisswitchedfromthe highspeedclocksource,fH,totheclocksource,fH/2~fH/64orfSUB.IftheclockisfromthefSUB,the highspeedclocksourcewillstoprunningtoconservepower.Theaccompanyingflowchartshows whathappenswhenthedevicemovesbetweenthevariousoperatingmodes. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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