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HT45F4MA Datasheet(PDF) 49 Page - Holtek Semiconductor Inc |
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HT45F4MA Datasheet(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 145 page  Rev. 1.20 �8 De�e��e� 1�� 201� Rev. 1.20 �9 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Low Voltage Reset – LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupplyvoltage ofthedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery, theLVRwillautomaticallyresetthedeviceinternallyandtheLVRFbitintheCTRLregisterwill alsobesetto1.ForavalidLVRsignal,alowsupplyvoltage,i.e.,avoltageintherangebetween 0.9V~VLVRmustexistforatimegreaterthanthatspecifiedbytLVRintheA.C.characteristics.Ifthe lowsupplyvoltagestatedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltage andwillnotperformaresetfunction.TheactualVLVRisfixedatavoltagevalueof2.55Vbythe LVSbitsintheLVRCregister.IftheLVS7~LVS0bitsarechangedtosomecertainvaluesbythe environmentalnoise,theLVRwillresetthedeviceafter2~3LIRCclockcycles.Whenthishappens, theLRFbitintheCTRLregisterwillbesetto1.Afterpowerontheregisterwillhavethevalueof 01010101B.NotethattheLVRfunctionwillbeautomaticallydisabledwhenthedeviceentersthe powerdownmode. LV R In te r nal R es et t RS TD + t SST Note:tRSTDispower-ondelay,typicaltime=50ms Low Voltage Reset Timing Chart • LVRC Register Bit 7 6 5 4 3 2 1 0 Na�e LVS7 LVS� LVS5 LVS� LVS3 LVS2 LVS1 LVS0 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 LVS7~LVS0:LVRvoltageselect 01010101:2.55V 00110011:2.55V 10011001:2.55V 10101010:2.55V Anyothervalue:GeneratesMCUreset–registerisresettoPORvalue Whenanactuallowvoltageconditionoccurs,asspecifiedbytheabovedefinedLVR voltagevalue,anMCUresetwillbegenerated.Theresetoperationwillbeactivated after2~3LIRCclockcycles.Inthissituationthisregistercontentswillremainthe sameaftersucharesetoccurs. Anyregistervalue,otherthanthefourdefinedvaluesabove,willalsoresultinthe generationofanMCUreset.Theresetoperationwillbeactivatedafter2~3LIRCclock cycles.HoweverinthissituationthisregistercontentswillberesettothePORvalue. |
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