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HT69F360 データシート(PDF) 78 Page - Holtek Semiconductor Inc |
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HT69F360 データシート(HTML) 78 Page - Holtek Semiconductor Inc |
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78 / 235 page  Rev. 1.30 7� �ove��e� 1�� �01� Rev. 1.30 79 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM Low Voltage Reset – LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe device.WritingacorrespondingvalueinLVRCregister,theLVRfunctioncanbeenabledduring thenormalandslowmodeswithaspecificLVRvoltage,VLVR.Ifthesupplyvoltageofthedevice dropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,theLVR willautomaticallyresetthedeviceinternallyandtheLVRFbitintheSMOD1registerwillalso besetto1.ForavalidLVRsignal,alowvoltage,i.e.,avoltageintherangebetween0.9V~VLVR mustexistforgreaterthanthevaluetLVRspecifiedintheLVD&LVRElectricalcharacteristics.If thelowvoltagestatedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltageand willnotperformaresetfunction.TheactualVLVRcanbeselectedbytheLVSbitsintheLVRC register.IftheLVS7~LVS0bitsarechangedtosomecertainvalues,whichmayoccurduetoadverse environmentalconditionssuchasnoise,theLVRwillresetthedeviceafter2~3fSUBclockcycles. Whenthishappens,theLRFbitintheSMOD1registerwillbesetto1.Afterpowerontheregister willhavethevalueof01100110B.NotethattheLVRfunctionwillbeautomaticallydisabledwhen thedeviceenterstheSLEEP/IDLEmode. 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 �a�e LVS7 LVS� LVS5 LVS4 LVS3 LVS� LVS1 LVS0 R/W R/W R/W R/W R/W R R R/W R/W POR 0 1 1 0 0 1 1 0 Bit7~0 LVS7 ~ LVS0:LVRVoltageSelectcontrol 01100110:1.7V(default) 01010101:1.9V 00110011:2.55V 10011001:3.15V 10101010:3.8V 11110000:LVRdisable Othervalues:GeneratesMCUreset–registerisresettoPORvalue Whenanactuallowvoltageconditionoccurs,asspecifiedbyoneofthefivedefined LVRvoltagevaluesabove,anMCUresetwillbegenerated.Theresetoperationwill beactivatedafter2~3fSUBclockcycles.Inthissituationthisregistercontentswill remainthesameaftersucharesetoccurs. Anyregistervalue,otherthanthefivedefinedvaluesabove,willalsoresultinthe generationofanMCUreset.Theresetoperationwillbeactivatedafter2~3fSUBclock cycles.HoweverinthissituationthisregistercontentswillberesettothePORvalue. |
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