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HT45R2K-C Fiches technique(PDF) 50 Page - Holtek Semiconductor Inc

No de pièce HT45R2K-C
Description  Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
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Fabricant  HOLTEK [Holtek Semiconductor Inc]
Site Internet  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R2K-C Fiches technique(HTML) 50 Page - Holtek Semiconductor Inc

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HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
Timer Mode
Inthismode,theTimer/EventCountercanbeutilisedtomeasurefixedtimeintervals,providing
aninternalinterruptsignaleachtimetheTimer/EventCounteroverflows.Tooperateinthismode,
theOperatingModeSelectbitpair,TnM1/TnM0,intheTimerControlRegistermustbesettothe
correctvalueasshown.
ControlRegisterOperatingModeSelectBitsfortheTimerMode
Bit7
Bit6
1
0
Inthismodetheinternalclockisusedasthetimerclock.Thetimerinputclocksourceiseither
fSYS,fSYS/4,fLorfTCK.However,thistimerclocksourceisfurtherdividedbyaprescaler,thevalueof
whichisdeterminedbythebitsTnPSC2~TnPSC0intheTimerControlRegister.Thetimer-onbit,
TnONmustbesethightoenablethetimertorun.Eachtimeaninternalclockhightolowtransition
occurs,thetimerincrementsbyone;whenthetimerisfullandoverflows,aninterruptsignalis
generatedandthetimerwillreloadthevaluealreadyloadedintothepreloadregisterandcontinue
counting.Atimeroverflowconditionandcorrespondinginternalinterruptisoneofthewake-up
sources,however,theinternalinterruptscanbedisabledbyensuringthattheETnIbitsoftheINTC0
andMFICregisterareresettozero.
Pr e sca le r Ou t put
In cr em en t
Ti me r Co nt ro ll er
Ti me r+ 1T im er +2
Ti me r+ N
Ti me r+ N+ 1
Timer Mode Timing Chart
Event Counter Mode
Inthismode,anumberofexternallychanginglogicevents,occurringontheexternaltimerTMRn
pin,canberecordedbytheTimer/EventCounter.Tooperateinthismode,theOperatingMode
Selectbitpair,TnM1/TnM0,intheTimerControlRegistermustbesettothecorrectvalueas
shown.
ControlRegisterOperatingModeSelectBitsfortheEventCounterMode
Bit7
Bit6
0
1
Inthismode,theexternaltimerTMRnpinisusedastheTimer/EventCounterclocksource,
howeveritisnotdividedbytheinternalprescaler.AftertheotherbitsintheTimerControlRegister
havebeensetup,theenablebitTnON,whichisbit4oftheTimerControlRegister,canbesethigh
toenabletheTimer/EventCountertorun.IftheActiveEdgeSelectbit,TnE,whichisbit3ofthe
TimerControlRegister,islow,theTimer/EventCounterwillincrementeachtimetheexternaltimer
pinreceivesalowtohightransition.IftheTnEishigh,thecounterwillincrementeachtimethe
externaltimerpinreceivesahightolowtransition.Whenitisfullandoverflows,aninterruptsignal
isgeneratedandtheTimer/EventCounterwillreloadthevaluealreadyloadedintothepreload
registerandcontinuecounting.TheinterruptcanbedisabledbyensuringthattheTimer/Event
CounterInterruptEnablebitinthecorrespondingInterruptControlRegisterisresettozero.
AstheexternaltimerpinissharedwithanI/Opin,toensurethatthepinisconfiguredtooperateas
aneventcounterinputpin,twothingshavetohappen.ThefirstistoensurethattheOperatingMode
SelectbitsintheTimerControlRegisterplacetheTimer/EventCounterintheEventCounting


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