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HT45F3W Datasheet(PDF) 142 Page - Holtek Semiconductor Inc |
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HT45F3W Datasheet(HTML) 142 Page - Holtek Semiconductor Inc |
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142 / 167 page  Rev. 1.50 14� De�e��e� 01� �01� Rev. 1.50 143 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU IfVDDisgreaterthan3.8V,thechargepumpinterruptflagwillbesetandthedeviceshouldturnoff thechargepumpautomaticallyusingtheapplicationprogram. TheChargePumpclocksourcecomesfromthesystemclock.TheCHPCKD[4:0]bitsareusedto settheclockdividerratiotogeneratethedesiredclockfrequencytoforthechargepumpmodule. Theactualfrequencyisdecidedbythefollowingformula: ChargePumpClockFrequency=(fSYS/16)/(CHPCKD+1) Itisrecommendedthatthechargepumpclockfrequencykeptcloseto20kHz.Theapplication programneedstosetthecorrectvaluetogetthedesiredclockfrequency.Forexample,fora4MHZ application,theCHPCKDbitsshouldbesetto11,andfora2MHzapplication,thecorrectvalueof CHPCKDis5. Thechargepumpmodulecontainsavoltagedetectcircuittodetectwhethertheinputvoltageis greaterthan3.8V.Thetworelatedcontrolbitsforchargepumpinputvoltagedetectoriscontained intheCTRL2register.TheCPDENbitisusedtoenableordisabletheinputvoltagedetectfunction. TheotherCPFbit,isareadonlybit.CPFisaflagbittorecordthecurrentchargepumpinput voltagestatus.Iftheinputvoltageisgreaterthan3.6V,theCPFwillbesethigh,otherwise,itwill beclearedtozero.Whentheinputvoltageisover3.6V,itisalsonecessarytotakenotethatacharge pumpinterruptwillbegenerated.Note:WhenenteringtheHALTmode,thehardwarewillturn offtheChargepumpautomaticallytopreventthechargepumpoutputbeinginanunknownstate. DuringthistimetheLCDcannotbeused.Note:About15msafterenablingtheregulator,astable outputwillbegenerated.Onlyafterthistimecantherelatedanalogcircuits(ADC,OPA,WDT, PGA,SCF)besetupandused.IfthePGAhasbeenenabled,thenwaitforabout400msbefore settingandoperatingtheADC. CTRL2 Register Bit 7 6 5 4 3 2 1 0 Na�e DACEN CPDEN INT1ES1 INT1ES0 INT0ES1 INT0ES0 CPF — R/W R/W R/W R/W R/W R/W R/W R — POR 0 0 1 0 1 0 0 — Bit7 Describedelsewhere Bit6 CPDEN:Chargepumpinputvoltagedetectorcircuitdisable/enablecontrol 0:disable 1:enable IfCPDEN=0,theChargepumpvoltageinputdetectorcircuitisdisabled,CPFwill remainat0,andthedetectorcircuitconsumesnopower. Bit5~2 Describedelsewhere Bit1 CPF:Chargepumpinputvoltagedetectorflag 0:Chargepumpinputvoltageisabove3.8V 1:Chargepumpinputvoltageisequaltoorunder3.8V WhenCPDENandREGCENareenabled,theCPFwillbeworking. Bit0 Unimplemented,readas“0” |
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