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HT48R002 データシート(PDF) 29 Page - Holtek Semiconductor Inc |
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HT48R002 データシート(HTML) 29 Page - Holtek Semiconductor Inc |
29 / 71 page Rev. 1.11 28 April 11, 2017 Rev. 1.11 29 April 11, 2017 HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU Low Voltage Reset – LVR Themicrocontrollercontainsanalwaysenabledlowvoltageresetcircuitinordertomonitorthe supplyvoltageofthedevice.Thisvoltageisfixedat2.1V(VLVR).Ifthesupplyvoltageofthedevice dropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingabattery,theLVRwill automaticallyresetthedeviceinternally. TheLVRincludesthefollowingspecifications:ForavalidLVRsignal,alowvoltage,i.e.,avoltage intherangebetween0.9V~VLVRmustexistforgreaterthanthevaluetLVRspecifiedintheA.C. characteristics.IfthelowvoltagestatedoesnotexceedtLVR,theLVRwillignoreitandwillnot performaresetfunction.NotethattheLVRfunctionwillautomaticallybedisabledwhentheMCU entersthePowerDownMode. LV R In te r nal R es et t RS TD + t SST Note:tRSTDispower-ondelay,typicaltime=50ms Low Voltage Reset Timing Chart Watchdog Time-out Reset during Normal Operation TheWatchdogtime-outResetduringnormaloperationisthesameasahardwareRESpinreset exceptthattheWatchdogtime-outflagTOwillbesetto“1”. t RS TD + t SST WD T Ti me -o ut In te r nal R es et Note:tRSTDispower-ondelay,typicaltime=50ms WDT Time-out Reset during Normal Operation Timing Chart Watchdog Time-out Reset during Sleep Mode TheWatchdogtime-outResetduringSleepModeisalittledifferentfromotherkindsofreset.Most oftheconditionsremainunchangedexceptthattheProgramCounterandtheStackPointerwillbe clearedto“0”andtheTOflagwillbesetto“1”.RefertotheA.C.CharacteristicsfortSSTdetails. t SST WD T Ti me -o ut In te r nal R es et Note:tSSTis16clockcyclesforthesystemclocksourceisprovidedbyHIRC. WDT Time-out Reset during Sleep Timing Chart |
同様の部品番号 - HT48R002 |
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同様の説明 - HT48R002 |
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