HT45F65 datasheet(62/231 Pages) HOLTEK

62 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

FormostapplicationsaresistorconnectedbetweenVDDandtheRESpinandacapacitorconnected

betweenVSSandtheRESpinwillprovideasuitableexternalresetcircuit.Anywiringconnectedto

theRESpinshouldbekeptasshortaspossibletominimiseanystraynoiseinterference.

ForapplicationsthatoperatewithinanenvironmentwheremorenoiseispresenttheEnhancedReset

Circuitshownisrecommended.

RE S

0. 1~ 1 m F

10k W ~

100k W

VD D

VS S

0. 01 m F* *

V DD

1N 4148*

300 W *

External RES Circuit

Note:*ItisrecommendedthatthiscomponentisaddedforaddedESDprotection.

**Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoiseis

significant.

MoreinformationregardingexternalresetcircuitsislocatedinApplicationNoteHA0075Eonthe

Holtekwebsite.

PullingtheRESPinlowusingexternalhardwarewillalsoexecuteadevicereset.Inthiscase,asin

thecaseofotherresets,theProgramCounterwillresettozeroandprogramexecutioninitiatedfrom

thispoint.

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

Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageof

thedevice,whichisselectedviaaconfigurationoption.Ifthesupplyvoltageofthedevicedrops

towithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,theLVRwill

automaticallyresetthedeviceinternally.TheLVRincludesthefollowingspecifications:Foravalid

LVRsignal,alowvoltage,i.e.,avoltageintherangebetween0.9V~VLVRmustexistforgreaterthan

thevaluetLVRspecifiedintheA.C.characteristics.IfthelowvoltagestatedoesnotexceedtLVR,the

LVRwillignoreitandwillnotperformaresetfunction.Oneofarangeofspecifiedvoltagevalues

forVLVRcanbeselectedusingconfigurationoptions.

LV R

In te r nal R es et

t RS TD + t SST

Low Voltage Reset Timing Chart

HT45F65 Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

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