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HT45F3520 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc |
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HT45F3520 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 134 page  Rev. 1.10 �8 De�e��e� 1�� �01� Rev. 1.10 �9 De�e��e� 1�� �01� HT45F3520/HT45F3530 Personal Care Flash MCU HT45F3520/HT45F3530 Personal Care Flash MCU System Operating Modes Therearefivedifferentmodesofoperationforthemicrocontroller,eachonewithitsown specialcharacteristicsandwhichcanbechosenaccordingtothespecificperformanceand powerrequirementsoftheapplication.Therearetwomodesallowingnormaloperationofthe microcontroller,theNORMALModeandSLOWMode.Theremainingthreemodes,theSLEEP, IDLE0andIDLE1modesareusedwhenthemicrocontrollerCPUisswitchedofftoconservepower. Operating Mode Description CPU fSYS fLIRC fTBC NORMAL �ode On fH~fH/�4 On On SLOW �ode On fL On On IDLE0 �ode Off Off On On IDLE1 �ode Off On On On SLEEP �ode Off Off On Off NORMAL Mode Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhasall ofitsfunctionsoperationalandwherethesystemclockisprovidedthehighspeedoscillator.This modeoperatesallowingthemicrocontrollertooperatenormallywithaclocksourcewillcomefrom thehighspeedoscillatorHIRC.Thehighspeedoscillatorwillhoweverfirstbedividedbyaratio rangingfrom1to64,theactualratiobeingselectedbytheCKS2~CKS0andHLCLKbitsinthe SMODregister.Althoughahighspeedoscillatorisused,runningthemicrocontrolleratadivided clockratioreducestheoperatingcurrent. SLOW Mode Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslower speedclocksource.TheclocksourceusedwillbefromthelowspeedoscillatorLIRC.Running themicrocontrollerinthismodeallowsittorunwithmuchloweroperatingcurrents.IntheSLOW Mode,thefHisoff. SLEEP Mode TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe SMODregisterislow.IntheSLEEPmodetheCPUwillbestopped.HoweverthefLIRCclockswill continuetooperateandtheWatchdogTimerfunctionisenabled. IDLE0 Mode TheIDLE0ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitinthe SMODregisterishighandtheFSYSONbitintheSMOD1registerislow.IntheIDLE0Modethe systemoscillatorwillbeinhibitedfromdrivingtheCPUbutsomeperipheralfunctionswillremain operationalsuchastheWatchdogTimerandTMs.IntheIDLE0Mode,thesystemoscillatorwillbe stopped. IDLE1 Mode TheIDLE1ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitinthe SMODregisterishighandtheFSYSONbitintheSMOD1registerishigh.IntheIDLE1Modethe systemoscillatorwillbeinhibitedfromdrivingtheCPUbutmaycontinuetoprovideaclocksource tokeepsomeperipheralfunctionsoperationalsuchastheWatchdogTimerandTMs.IntheIDLE1 Mode,thesystemoscillatorwillcontinuetorun,andthissystemoscillatormaybehighspeedorlow speedsystemoscillator.IntheIDLE1Mode,theWatchdogTimerclock,fLIRC,willbeon. |
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