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HT45R4U датащи(PDF) 41 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 41 Page - Holtek Semiconductor Inc

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Rev. 1.10
40
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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
Timer Registers − TMR0, TMR1, TMR2
ThetimerregistersarespecialfunctionregisterslocatedintheSpecialPurposeDataMemoryandisthe
placewheretheactualtimervalueisstored.TheseregistersareknownasTMR0,TMR1orTMR2.The
valueinthetimerregistersincreasesbyoneeachtimeaninternalclockpulseisreceivedoranexternal
transitionoccursontheexternaltimerpin.Thetimerwillcountfromtheinitialvalueloadedbythe
preloadregistertothefullcountofFFHforthe8-bittimeratwhichpointthetimeroverflowsandan
internalinterruptsignalisgenerated.Thetimervaluewillthenberesetwiththeinitialpreloadregister
valueandcontinuecounting.
ToachieveamaximumfullrangecountofFFHforthe8-bittimer,thepreloadregistersmustfirst
beclearedtoallzeros.Itshouldbenotedthatafterpower-on,thepreloadregisterwillbeinan
unknowncondition.NotethatiftheTimer/EventCounterisswitchedoffanddataiswrittentoits
preloadregisters,thisdatawillbeimmediatelywrittenintotheactualtimerregisters.However,
iftheTimer/EventCounterisenabledandcounting,anynewdatawrittenintothepreloaddata
registersduringthisperiodwillremaininthepreloadregistersandwillonlybewrittenintothe
timerregistersthenexttimeanoverflowoccurs.
Timer Control Registers − TMR0C, TMR1C, TMR2C
TheflexiblefeaturesoftheHoltekmicrocontrollerTimer/EventCountersenablethemtooperateinthree
differentmodes,theoptionsofwhicharedeterminedbythecontentsoftheirrespectivecontrolregister.
ItistheTimerControlRegistertogetherwithitscorrespondingtimerregistersthatcontrolthe
fulloperationoftheTimer/EventCounters.Beforethetimerscanbeused,itisessentialthatthe
appropriateTimerControlRegisterisfullyprogrammedwiththerightdatatoensureitscorrect
operation,aprocessthatisnormallycarriedoutduringprograminitialisation.
Tochoosewhichofthethreemodesthetimeristooperatein,eitherinthetimermode,theevent
countingmodeorthepulsewidthmeasurementmode,bits7and6ofthecorrespondingTimer
ControlRegister,whichareknownasthebitpairTnM1/TnM0,mustbesettotherequired
logiclevels.Thetimer-onbit,whichisbit4oftheTimerControlRegisterandknownasTnON,
dependinguponwhichtimerisused,providesthebasicon/offcontroloftherespectivetimer.
Settingthebithighallowsthecountertorun,clearingthebitstopsthecounter.Fortimersthathave
prescalers,bits0~2oftheTimerControlRegisterdeterminethedivisionratiooftheinputclock
prescaler.Theprescalerbitsettingshavenoeffectifanexternalclocksourceisused.Ifthetimeris
intheeventcountorpulsewidthmeasurementmode,theactivetransitionedgeleveltypeisselected
bythelogiclevelofbit3oftheTimerControlRegisterwhichisknownasTnEG.
TMRnC Register
Bit
7
6
5
4
3
2
1
0
Name
Tn�1
Tn�0
TnON
TnEG
TnPSC� TnPSC1 TnPSC0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
1
0
0
0
Bit7~6
TnM[1:0]:Operatingmodeselect
00:nomodeavailable
01:EventCountermode
10:Timermode
11:PulseWidthMeasurementmode
Bit5
Unimplemented,readas"0"
Bit4
TnON:Timer/EventCountercountingenable
0:enable
1:disable


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