HT45F3W datasheet(100/167 Pages) HOLTEK

100 / 167 page

Rev. 1.50

100

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Rev. 1.50

101

De�e��e� 01� �01�

HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter Flash MCU

Single Pulse Mode

Toselectthismode,bitsT2M1andT2M0intheTM2C1registershouldbesetto10respectively

andalsotheT2IO1andT2IO0bitsshouldbesetto11respectively.TheSinglePulseOutputMode,

asthenamesuggests,willgenerateasingleshotpulseontheTMoutputpin.

ThetriggerforthepulseoutputleadingedgeisalowtohightransitionoftheT2ONbit,whichcan

beimplementedusingtheapplicationprogram.HoweverintheSinglePulseMode,theT2ONbit

canalsobemadetoautomaticallychangefromlowtohighusingtheexternalTCK2pin,whichwill

inturninitiatetheSinglePulseoutput.WhentheT2ONbittransitionstoahighlevel,thecounter

willstartrunningandthepulseleadingedgewillbegenerated.TheT2ONbitshouldremainhigh

whenthepulseisinitsactivestate.Thegeneratedpulsetrailingedgewillbegeneratedwhenthe

T2ONbitisclearedtozero,whichcanbeimplementedusingtheapplicationprogramorwhena

comparematchoccursfromComparatorA.

Leadi ng Ed ge

Tn ON b it

0 ® 1

S/ W Co mm an d

SET " Tn ON "

TC Kn P in T ra ns it io n

Tn ON b it

1 ® 0

S/ W Co mm an d

CL R "T nO N"

CCR A Ma tc h C om pa re

Pu ls e Wi dt h = CCRA V al ue

Tr a ili ng E dge

TP nA O ut put P in

Single Pulse Generation (n=2)

HoweveracomparematchfromComparatorAwillalsoautomaticallycleartheT2ONbitandthus

generatetheSinglePulseoutputtrailingedge.InthiswaytheCCRAvaluecanbeusedtocontrol

thepulsewidth.AcomparematchfromComparatorAwillalsogenerateaTMinterrupt.Thecounter

canonlyberesetbacktozerowhentheT2ONbitchangesfromlowtohighwhenthecounter

restarts.IntheSinglePulseModeCCRPisnotused.TheT2CCLRandT2DPXbitsarenotusedin

thisMode.

HT45F3W Datasheet(PDF) 100 Page - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 100 Page - Holtek Semiconductor Inc

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