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HT45F3230 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc |
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HT45F3230 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 148 page  Rev. 1.00 38 January 13, 2017 Rev. 1.00 39 January 13, 2017 HT45F3230 IR Sensing/Motor Driving Flash MCU HT45F3230 IR Sensing/Motor Driving Flash MCU CTRL Register Bit 7 6 5 4 3 2 1 0 Name FSYSON — — — — LVRF LRF WRF R/W R/W — — — — R/W R/W R/W POR 0 — — — — x 0 0 “x” unknown Bit7 FSYSON:fSYSControlinIDLEMode 0:Off 1:On Bit6~3 Unimplemented,readas“0” Bit2 LVRF:LVRfunctionresetflag Describedelsewhere. Bit1 LRF:LVRControlregistersoftwareresetflag Describedelsewhere. Bit0 WRF:WDTControlregistersoftwareresetflag Describedelsewhere. Operating Mode Switching Thedevicecanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating currentandprolongingbatterylifeinportableapplications. Insimpleterms,ModeSwitchingbetweentheNORMALModeandSLOWModeisexecuted usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromthe NORMAL/SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.When aHALTinstructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeis determinedbytheconditionoftheIDLENbitintheSMODregisterandFSYSONintheCTRL register. WhentheHLCLKbitswitchestoalowlevel,whichimpliesthatclocksourceisswitchedfromthe highspeedclocksource,fH,totheclocksource,fH/2~fH/64orfSUB.IftheclockisfromthefSUB,the highspeedclocksourcewillstoprunningtoconservepower.Whenthishappensitmustbenoted thatthefH/16andfH/64internalclocksourceswillalsostoprunning,whichmayaffecttheoperation ofotherinternalfunctions.Theaccompanyingflowchartshowswhathappenswhenthedevice movesbetweenthevariousoperatingmodes. |
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