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HT45F75 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 190 page  Rev. 1.10 50 De�e��e� 1�� �01� Rev. 1.10 51 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Fast Wake-up TominimisepowerconsumptionthedevicecanentertheSLEEPorIDLE0Mode,wherethesystem clocksourcetothedevicewillbestopped.Howeverwhenthedeviceiswokenupagain,itcantake aconsiderabletimefortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperation toresume.ToensurethedeviceisupandrunningasfastaspossibleaFastWake-upfunctionis provided,whichallowsfSUB,namelyeithertheLXTorLIRCoscillator,toactasatemporaryclock tofirstdrivethesystemuntiltheoriginalsystemoscillatorhasstabilised.Astheclocksourcefor theFastWake-upfunctionisfSUB,theFastWake-upfunctionisonlyavailableintheSLEEP1and IDLE0modes.WhenthedeviceiswokenupfromtheSLEEP0mode,theFastWake-upfunctionhas noeffectbecausethefSUBclockisstopped.TheFastWake-upenable/disablefunctioniscontrolled usingtheFSTENbitintheSMODregister. IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLIRCorLXToscillatorfor thesystemtowake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024 HXTclockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwill switchovertooperatingfromtheHXToscillator. IftheHIRCoscillatororLIRCoscillatorisusedasthesystemoscillatorthenitwilltake15~16 clockcyclesoftheHIRCor1~2cyclesoftheLIRCtowakeupthesystemfromtheSLEEPor IDLE0Mode.TheFastWake-upbit,FSTENwillhavenoeffectinthesecases. 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�� HXT �y�les 10�� HXT �y�les 1~� HXT �y�les 1 10�� HXT �y�les 1~� fSUB �y�les (Syste� �uns with fSUB first for 1024 HXT �y�les and then swit�hes ove� to �un with the HXT �lo�k) 1~� HXT �y�les HIRC x 15~1� HIRC �y�les 15~1� HIRC �y�les 1~� HIRC �y�les LIRC x 1~� LIRC �y�les 1~� LIRC �y�les 1~� LIRC �y�les LXT x 10�� LXT �y�les 10�� LXT �y�les 1~� LXT �y�les “x”: don’t �a�e Wake-Up Times NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLXTandLIRCareallbothoff, thentherewillbenoFastWake-upfunctionavailablewhenthedevicewake-upfromtheSLEEP0 Mode. Operating Mode Switching Thedevicecanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating currentandprolongingbatterylifeinportableapplications. Insimpleterms,ModeSwitchingbetweentheNORMALModeandSLOWModeisexecuted usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromthe NORMAL/SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.When aHALTinstructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeis determinedbytheconditionoftheIDLENbitintheSMODregisterandFSYSONintheCTRL register. |
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