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HT48R002 データシート(PDF) 29 Page - Holtek Semiconductor Inc

部品番号 HT48R002
部品情報  Cost-Effective I/O 8-Bit OTP MCU
Download  71 Pages
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R002 データシート(HTML) 29 Page - Holtek Semiconductor Inc

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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


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