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HT45R4U датащи(PDF) 68 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 68 Page - Holtek Semiconductor Inc |
68 / 105 page Rev. 1.10 68 �a��� 1�� �01� Rev. 1.10 69 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD ForapplicationsthatoperatewithinanenvironmentwheremorenoiseispresenttheResetCircuit shownisrecommended. RE S/ PE 1 0. 1~ 1 m F 10 k W ~ 100k W VD D VSS 0. 01 m F* * V DD 1N 4148 * 30 0 W * Note:"*"ItisrecommendedthatthiscomponentisaddedforaddedESDprotection "**"Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoiseis significant. External RES Circuit RES Pin Reset ThistypeofresetoccurswhenthemicrocontrollerisalreadyrunningandtheRESpinisforcefully pulledlowbyexternalhardwaresuchasanexternalswitch.Inthiscaseasinthecaseofotherreset, theProgramCounterwillresettozeroandprogramexecutioninitiatedfromthispoint. RE S In te r nal R es et 0. 9 V DD 0. 4 V DD t RS TD + t SST RES Reset Timing Chart Low Voltage Reset − LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupplyvoltageof thedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,theLVR willautomaticallyresetthedeviceinternallyandtheLVRFbitintheSMOD1registerwillalsobeset to1.ForavalidLVRsignal,alowsupplyvoltage,i.e.,avoltageintherangebetween0.9V~VLVRmust existforatimegreaterthanthatspecifiedbytLVRintheA.C.characteristics.Ifthelowsupplyvoltage statedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltageandwillnotperformareset function.TheactualVLVRvalueisfixedbytheLVSbitsintheLVRCregister.IftheLVS7~LVS0bits haveanyothervalue,whichmayperhapsoccurduetoadverseenvironmentalconditionssuchasnoise, theLVRwillresetthedeviceafter2~3fLIRCclockcycles.Whenthishappens,theLRFbitintheSMOD1 registerwillbesetto1.Afterpowerontheregisterwillhavethevalueof01010101B.NotethattheLVR functionwillbeautomaticallydisabledwhenthedeviceentersthepowerdownmode. LV R In te r nal R es et t RS TD + t SST Low Voltage Reset Timing Chart |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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