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HT66F0174 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc |
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HT66F0174 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 115 page  Rev. 1.00 �8 ���� 11� �01� Rev. 1.00 �9 ���� 11� �01� HT66F0172/HT66F0174 Enhanced A/D Flash 8-Bit MCU Bit1 IDLEN:IDLEModeControl 0:Disable 1:Enable ThisistheIDLEModeControlbitanddetermineswhathappenswhentheHALT instructionisexecuted.Ifthisbitishigh,whenaHALTinstructionisexecutedthe devicewillentertheIDLEMode.IntheIDLE1ModetheCPUwillstoprunning butthesystemclockwillcontinuetokeeptheperipheralfunctionsoperational,if FSYSONbitishigh.IfFSYSONbitislow,theCPUandthesystemclockwillallstop inIDLE0mode.IfthebitislowthedevicewillentertheSLEEPModewhenaHALT instructionisexecuted. Bit0 HLCLK:SystemClockSelection 0:fH/2~fH/64orfL 1:fH ThisbitisusedtoselectifthefHclockorthefH/2~fH/64orfLclockisusedasthe systemclock.WhenthebitishighthefHclockwillbeselectedandiflowthefH/2~ fH/64orfLclockwillbeselected.WhensystemclockswitchesfromthefHclocktothe fLclockandthefHclockwillbeautomaticallyswitchedofftoconservepower. 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 Bit7 FSYSON:fSYSControlinIDLEMode 0:Disable 1:Enable Bit6~3 Unimplemented,readas0. Bit2 LVRF:LVRfunctionresetflag 0:Notoccur 1:Occurred Thisbitissetto1whenaspecificLowVoltageResetsituationconditionoccurs.This bitcanonlybeclearedto0bytheapplicationprogram. Bit1 LRF:LVRCControlregistersoftwareresetflag 0:Notoccur 1:Occurred Thisbitissetto1iftheLVRCregistercontainsanynondefinedLVRvoltageregister values.Thisineffectactslikeasoftwareresetfunction.Thisbitcanonlybeclearedto 0bytheapplicationprogram. Bit0 WRF:WDTControlregistersoftwareresetflag 0:Notoccur 1:Occurred Thisbitissetto1bytheWDTControlregistersoftwareresetandclearedbythe applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication program. |
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