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HT45F56 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc |
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HT45F56 Datasheet(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 90 page  Rev. 1.11 32 April 11, 2017 Rev. 1.11 33 April 11, 2017 HT45F56 Shock Detector Flash MCU HT45F56 Shock Detector Flash MCU Operating Mode Switching Thedevicescanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating currentandprolongingbatterylifeinportableapplications.Insimpleterms,ModeSwitching betweentheNORMALModeandSLOWModeisexecutedusingtheHLCLKbitandCKS2~CKS0 bitsintheSMODregisterwhileModeSwitchingfromtheNORMAL/SLOWModestotheSLEEP/ IDLEModesisexecutedviatheHALTinstruction.WhenaHALTinstructionisexecuted,whether thedeviceenterstheIDLEModeortheSLEEPModeisdeterminedbytheconditionoftheIDLEN bitintheSMODregisterandFSYSONintheSMOD1register.WhentheHLCLKbitswitchesto alowlevel,whichimpliesthatclocksourceisswitchedfromthehighspeedclocksource,fH,to theclocksource,fH/2~fH/64orfSUB.IftheclockisfromthefSUB,thehighspeedclocksourcewill stoprunningtoconservepower.WhenthishappensitmustbenotedthatthefH/16andfH/64internal clocksourceswillalsostoprunning,whichmayaffecttheoperationofotherinternalfunctionssuch astheTMs. NORMAL fSYS=fH~fH/64 fH on CPU run fSYS on fSUB on SLOW fSYS=fSUB fSUB on CPU run fSYS on fH off IDLE0 HALT instruction executed CPU stop IDLEN=1 FSYSON=0 fSYS off fSUB on IDLE1 HALT instruction executed CPU stop IDLEN=1 FSYSON=1 fSYS on fSUB on SLEEP1 HALT instruction executed fSYS off CPU stop IDLEN=0 fSUB on WDT on SLEEP0 HALT instruction executed fSYS off CPU stop IDLEN=0 fSUB off WDT off |
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