HT45F4M datasheet(68/138 Pages) HOLTEK

68 / 138 page

Rev. 1.10

�an�a�� 1�� 01�

Rev. 1.10

�an�a�� 1�� 01�

HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

CCRA

CCRP

Co�nte� Val�e

Co�nte� Clea�ed

b� CCRA

CCRA Int.

Flag TnAF

üüüü

Flag TnPF

TM O/P Pin

TnOC = 1

TnON

Co�nte� Stop

if TnON bit low

Co�nte� �eset

when TnON

�et��ns high

PWM �es�mes

ope�ation

Time

TnPOL

O�tp�t Inve�ts

When TnPOL = 1

TM O/P Pin

TnOC = 0

TnPAU

Res�me

Pa�se

TnDPX = 1; TnM [1:0] = 10

O�tp�t cont�olled b�

othe� pin-üüüüüüü

PWM Pe�iod

set b� CCRA

PWM D�t� C�cle

set b� CCRP

PWM Mode -- TnDPX = 1

Note:1.HereTnDPX=1-CounterclearedbyCCRA

2.AcounterclearsetsPWMPeriod

3.TheinternalPWMfunctioncontinuesevenwhenTnIO[1:0]=00or01

4.TheTnCCLRbithasnoinfluenceonPWMoperation

5.n=0

Single Pulse Mode

Toselectthismode,bitsT0M1andT0M0intheTM0C1registershouldbesetto10respectively

andalsotheT0IO1andT0IO0bitsshouldbesetto11respectively.TheSinglePulseOutputMode,

asthenamesuggests,willgenerateasingleshotpulseontheTMoutputpin.

ThetriggerforthepulseoutputleadingedgeisalowtohightransitionoftheT0ONbit,whichcan

beimplementedusingtheapplicationprogram.HoweverintheSinglePulseMode,theT0ONbit

canalsobemadetoautomaticallychangefromlowtohighusingtheexternalTCK0pin,whichwill

inturninitiatetheSinglePulseoutput.WhentheT0ONbittransitionstoahighlevel,thecounter

willstartrunningandthepulseleadingedgewillbegenerated.TheT0ONbitshouldremainhigh

whenthepulseisinitsactivestate.Thegeneratedpulsetrailingedgewillbegeneratedwhenthe

T0ONbitisclearedtozero,whichcanbeimplementedusingtheapplicationprogramorwhena

comparematchoccursfromComparatorA.

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