HT45F77 datasheet(98/203 Pages) HOLTEK

98 / 203 page

Rev. 1.20

De�e��e� 1�� 201�

Rev. 1.20

De�e��e� 1�� 201�

HT45F77

Body Fat Scale Flash MCU

HT45F77

Body Fat Scale Flash MCU

Single Pulse Output Mode

Toselectthismode,therequiredbitpairs,TnM1andTnM0shouldbesetto10respectivelyandalso

thecorrespondingTnIO1andTnIO0bitsshouldbesetto11respectively.TheSinglePulseOutput

Mode,asthenamesuggests,willgenerateasingleshotpulseontheTMoutputpin.

ThetriggerforthepulseoutputleadingedgeisalowtohightransitionoftheTnONbit,whichcan

beimplementedusingtheapplicationprogram.HoweverintheSinglePulseMode,theTnONbit

canalsobemadetoautomaticallychangefromlowtohighusingtheexternalTCKnpin,whichwill

inturninitiatetheSinglePulseoutput.WhentheTnONbittransitionstoahighlevel,thecounter

willstartrunningandthepulseleadingedgewillbegenerated.TheTnONbitshouldremainhigh

whenthepulseisinitsactivestate.Thegeneratedpulsetrailingedgewillbegeneratedwhenthe

TnONbitisclearedtozero,whichcanbeimplementedusingtheapplicationprogramorwhena

comparematchoccursfromComparatorA.

HoweveracomparematchfromComparatorAwillalsoautomaticallycleartheTnONbitandthus

generatetheSinglePulseoutputtrailingedge.InthiswaytheCCRAvaluecanbeusedtocontrolthe

pulsewidth.AcomparematchfromComparatorAwillalsogenerateTMinterrupts.Thecountercan

onlyberesetbacktozerowhentheTnONbitchangesfromlowtohighwhenthecounterrestarts.In

theSinglePulseModeCCRPisnotused.TheTnCCLRbitisalsonotused.

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

TM n Ou tp ut P in

Single Pulse Generation (n=1 or 2)

HT45F77 Datasheet(PDF) 98 Page - Holtek Semiconductor Inc