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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3520 데이터시트(PDF) 41 Page - Holtek Semiconductor Inc |
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HT45F3520 데이터시트(HTML) 41 Page - Holtek Semiconductor Inc |
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41 / 134 page  Rev. 1.10 40 De�e��e� 1�� �01� Rev. 1.10 41 De�e��e� 1�� �01� HT45F3520/HT45F3530 Personal Care Flash MCU HT45F3520/HT45F3530 Personal Care Flash MCU SMOD1 Register Bit 7 6 5 4 3 2 1 0 Na�e FSYSON — — — — LVRF — WRF R/W R/W — — — — R/W — R/W POR 0 — — — — x — 0 "x" unknown Bit7 FSYSON:fSYSControlinIDLEMode 0:Disable 1:Enable Bit6~3 Unimplemented,readas"0" Bit2 LVRF:LVRfunctionresetflag Describeelsewhere Bit1 Unimplemented,readas"0" Bit0 WRF:WDTControlregistersoftwareresetflag Describeelsewhere Operating Mode Switching Thedevicescanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating currentandprolongingbatterylifeinportableapplications. Insimpleterms,ModeSwitchingbetweentheNORMALModeandSLOWModeisexecutedusingthe HLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromtheNORMAL/ SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.WhenaHALT instructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeisdeterminedby theconditionoftheIDLENbitintheSMODregisterandFSYSONintheSMOD1register. WhentheHLCLKbitswitchestoalowlevel,whichimpliesthatclocksourceisswitchedfromthe highspeedclocksource,fH,totheclocksource,fH/2~fH/64orfL.IftheclockisfromthefL,thehigh speedclocksourcewillstoprunningtoconservepower.Whenthishappensitmustbenotedthatthe fH/16andfH/64internalclocksourceswillalsostoprunning,whichmayaffecttheoperationofother internalfunctionssuchastheTMs. NORMAL fSYS=fH~fH/�4 fH on CPU �un fSYS on fTBC on SLOW fSYS=fL fL on CPU �un fSYS on fTBC on fH off IDLE0 HALT inst�u�tion exe�uted CPU stop IDLEN=1 FSYSON=0 fSYS off fTBC on IDLE1 HALT inst�u�tion exe�uted CPU stop IDLEN=1 FSYSON=1 fSYS on fTBC on SLEEP HALT inst�u�tion exe�uted fSYS off CPU stop IDLEN=0 fTBC off WDT on |
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