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HT66F4530 Datasheet(PDF) 68 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 68 Page - Holtek Semiconductor Inc |
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68 / 224 page ![]() Rev. 1.00 �8 De�e��e� �1� �01� Rev. 1.00 �9 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers • RSTC Register Bit 7 6 5 4 3 2 1 0 Na�e RSTC7 RSTC� RSTC5 RSTC4 RSTC3 RSTC� RSTC1 RSTC0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 1 0 1 0 1 0 1 Bit7~0 RSTC7~RSTC0:PC2/RESselection 01010101:configuredasPC2orotherpin-sharedfunctions 10101010:configuredasRESpin Othervalues:ResetMCU Ifthesebitsarechangedduetoadverseenvironmentalconditions,themicrocontroller willbereset.TheresetoperationwillbeactivatedaftertSRESETtimeandtheRSTFbit intheRSTFCregisterwillbesetto1. AllresetswillresetthisregistertoPORvalueexcepttheWDTtimeouthardware warmreset.Notethatiftheregisterissetto10101010toselecttheRESpin,this configurationhashigherprioritythanotherrelatedpin-sharedcontrols. • RSTFC Register Bit 7 6 5 4 3 2 1 0 Na�e — — — — RSTF LVRF LRF WRF R/W — — — — R/W R/W R/W R/W POR — — — — 0 x 0 0 "x": unknown Bit7~4 Unimplemented,readas"0" Bit3 RSTF:Resetcontrolregistersoftwareresetflag 0:Notoccurred 1:Occurred Thisbitissetto1bytheRSTCcontrolregistersoftwareresetandclearedbythe applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication program. Bit2 LVRF:LVRfunctionresetflag Describedelsewhere. Bit1 LRF:LVRcontrolregistersoftwareresetflag Describedelsewhere. Bit0 WRF:WDTcontrolregistersoftwareresetflag Describedelsewhere. Low Voltage Reset – LVR Themicrocontrollerscontainalowvoltageresetcircuitinordertomonitorthesupplyvoltageof thesedevicesandprovideanMCUresetshouldthevaluefallbelowacertainpredefinedlevel. TheLVRfunctionisalwaysenabledwithaspecificLVRvoltageVLVR.Ifthesupplyvoltageof thesedevicesdroptowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery inbatterypoweredapplications,theLVRwillautomaticallyresetthesedevicesinternallyandthe LVRFbitintheRSTFCregisterwillalsobesetto1.ForavalidLVRsignal,alowsupplyvoltage,i.e., avoltageintherangebetween0.9V~VLVRmustexistforatimegreaterthanthatspecifiedbytLVR intheLVD&LVRElectricalCharacteristics.Ifthelowsupplyvoltagestatedoesnotexceedthis value,theLVRwillignorethelowsupplyvoltageandwillnotperformaresetfunction.Theactual VLVRvaluecanbeselectedbytheLVSbitsintheLVRCregister.IftheLVS7~LVS0bitsarechanged tosomedifferentvaluesbyenvironmentalnoise,theLVRwillresetthesedevicesaftertSRESETtime. Whenthishappens,theLRFbitintheRSTFCregisterwillbesetto1.Afterpowerontheregister willhavethevalueof01010101B.NotethattheLVRfunctionwillbeautomaticallydisabledwhen thesedevicesenterthepowerdownmode. |
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