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HT45FM2C Datasheet(PDF) 92 Page - Holtek Semiconductor Inc

Part # HT45FM2C
Description  Brushless DC Motor Flash Type 8-Bit MCU
PDF  171 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45FM2C Datasheet(HTML) 92 Page - Holtek Semiconductor Inc

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Rev. 1.10
9�
�a� �0� �01�
Rev. 1.10
9�
�a� �0� �01�
HT45FM2C
Brushless DC Motor Flash Type 8-Bit MCU
HT45FM2C
Brushless DC Motor Flash Type 8-Bit MCU
Preliminar�
A/D Operation
TherearetwowaystoinitiateanA/DConverterconversioncycle,selectedusingtheADSTSbit.
ThefirstoftheseistousetheADSTRbitintheADCR0registerusedtostartandresettheA/D
converter.Whenthemicrocontrollerprogramsetsthisbitfromlowtohighandthenlowagain,
ananalogtodigitalconversioncyclewillbeinitiated.WhentheADSTRbitisbroughtfromlow
tohighbutnotlowagain,theEOCBbitintheADCR0registerwillbesethighandtheanalogto
digitalconverterwillbereset.
ThesecondmethodofinitiatingaconversionistouesethePWMinterruptsignal.Thiscanbe
sourcedfromeitherthePWMperiodordutyinterruptsignal,selectedusingthePWISbit.The
DLSTRbitcanactivateadelayfunctionwhichinsertsadelaytimebetweentheincomingPWM
interruptsignalandtheactualstartoftheA/Dconversionprocess,withtheactualtimebeingsetup
usingtheADDLregister.Theactualdelaytimeiscalculatedbytheregistercontentmultipliedbythe
systemclockperiod.ThedelaybetweenthePWMinterruptandthestartoftheA/Dconversionis
toreducethepossibilityoferroneousanalogsamplesbeingtakenduringthetimeoflargetransient
currentswitchingbythemotordrivetransistors.NotethatiftheDLSTRbitselectsnodelaythe
ADDLregistermustbeclearedtozeroandvice-versaifthedelayisselected,thenanon-zerovalue
mustbeprogrammedintotheADDLregister.
TheEOCBbitintheADCR0registerisusedtoindicatewhentheanalogtodigitalconversion
processiscomplete.Thisbitwillbeautomaticallysettozerobythemicrocontrolleraftera
conversioncyclehasended.Inaddition,thecorrespondingA/Dinterruptrequestflagwillbeset
intheinterruptcontrolregister,andiftheinterruptsareenabled,anappropriateinternalinterrupt
signalwillbegenerated.ThisA/Dinternalinterruptsignalwilldirecttheprogramflowtothe
associatedA/Dinternalinterruptaddressforprocessing.IftheA/Dinternalinterruptisdisabled,
themicrocontrollercanbeusedtopolltheEOCBbitintheADCR0registertocheckwhetherithas
beenclearedasanalternativemethodofdetectingtheendofanA/Dconversioncycle.
TheclocksourcefortheA/Dconverter,whichoriginatesfromthesystemclockfSYS,canbechosen
tobeeitherfSYSorasubdividedversionoffSYS.Thedivisionratiovalueisdeterminedbythe
ADCK2~ADCK0bitsintheADCR1register.AlthoughtheA/Dclocksourceisdeterminedby
thesystemclocky,fSYS,andbybitsADCK2~ADCK0,therearesomelimitationsonthemaximum
A/Dclocksourcespeedthatcanbeselected.AstheminimumvalueofpermissibleA/Dclock
period,tADCK,is0.5μs,caremustbetakenforsystemclockfrequenciesequaltoorgreaterthan
4MHz.Forexample,ifthesystemclockoperatesatafrequencyof4MHz,theADCK2~ADCK0bits
shouldnotbesetto“000”.DoingsowillgiveA/DclockperiodsthatarelessthantheminimumA/D
clockperiodwhichmayresultininaccurateA/Dconversionvalues.Refertothefollowingtablefor
examples,wherevaluesmarkedwithanasterisk*showwhere,dependinguponthedevice,special
caremustbetaken,asthevaluesmaybelessthanthespecifiedminimumA/DClockPeriod.
fSYS
A/D Clock Period (tADCK)
ADCK2,
ADCK1,
ADCK0
=000
(fSYS)
ADCK2,
ADCK1,
ADCK0
=001
(fSYS/2)
ADCK2,
ADCK1,
ADCK0
=010
(fSYS/4)
ADCK2,
ADCK1,
ADCK0
=011
(fSYS/8)
ADCK2,
ADCK1,
ADCK0
=100
(fSYS/16)
ADCK2,
ADCK1,
ADCK0
=101
(fSYS/32)
ADCK2,
ADCK1,
ADCK0
=110
(fSYS/64)
ADCK2,
ADCK1,
ADCK0
=111
5�Hz
�00ns*
400ns*
800ns
1.6μs
3.2μs
6.4μs
12.8μs
Undefined
10�Hz
100ns*
�00ns*
400ns*
800ns
1.6μs
3.2μs
6.4μs
Undefined
�0�Hz
50ns*
100ns*
�00ns*
400ns*
800ns
1.6μs
3.2μs
Undefined
A/D Clock Period Examples
Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe
ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Evenifno
pinsareselectedforuseasA/DinputsbyclearingthePCR7~PCR0bitsintheANCSR0registerand
PCR8intheANCSR1register,iftheADOFFbitiszerothensomepowerwillstillbeconsumed.
InpowerconsciousapplicationsitisthereforerecommendedthattheADOFFissethightoreduce
powerconsumptionwhentheA/Dconverterfunctionisnotbeingused.



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