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HT82B42R Datenblatt(PDF) 33 Page - Holtek Semiconductor Inc

Teilenummer HT82B42R
Bauteilbeschribung  I/O MCU with USB Interface
Download  84 Pages
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82B42R Datenblatt(HTML) 33 Page - Holtek Semiconductor Inc

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Rev. 1.10
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Rev. 1.10
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HT82B42R/HT82B42RE
I/O MCU with USB Interface
Ti me r+ 2
Ex te rn al E ve nt
In cr em en t
Ti me r C oun te r
Ti me r+ 3
Ti me r+ 1
Event Counter Mode Timing Chart
Configuring the Pulse Width Measurement Mode
Inthismode,theTimer/EventCountercanbeutilisedtomeasurethewidthofexternalpulses
appliedtotheexternaltimerpin.Tooperateinthismode,theOperatingModeSelectbitpair,
T0M1/T0M0orT1M1/T1M0,intheTimerControlRegistermustbesettothecorrectvalueas
shown.
Cont�ol Registe� Ope�ating Mode
Select Bits fo� the Pulse Width Captu�e Mode
Bit7
Bit6
1
1
Inthismodetheinternalclock,fSYS/4isusedastheinternalclockfortheTimer/EventCounters.
AftertheotherbitsintheTimerControlRegisterhavebeensetup,theenablebitT0ONorT1ON,
whichisbit4oftheTimerControlRegister,canbesethightoenabletheTimer/EventCounter,
howeveritwillnotactuallystartcountinguntilanactiveedgeisreceivedontheexternaltimerpin.
IftheActiveEdgeSelectbitT0EorT1E,whichisbit3oftheTimerControlRegister,islow,oncea
hightolowtransitionhasbeenreceivedontheexternaltimerpin,TMR0orTMR1,theTimer/Event
Counterwillstartcountinguntiltheexternaltimerpinreturnstoitsoriginalhighlevel.Atthispoint
theenablebitwillbeautomaticallyresettozeroandtheTimer/EventCounterwillstopcounting.If
theActiveEdgeSelectbitishigh,theTimer/EventCounterwillbegincountingoncealowtohigh
transitionhasbeenreceivedontheexternaltimerpinandstopcountingwhentheexternaltimerpin
returnstoitsoriginallowlevel.Asbefore,theenablebitwillbeautomaticallyresettozeroandthe
Timer/EventCounterwillstopcounting.ItisimportanttonotethatinthePulseWidthMeasurement
Mode,theenablebitisautomaticallyresettozerowhentheexternalcontrolsignalontheexternal
timerpinreturnstoitsoriginallevel,whereasintheothertwomodestheenablebitcanonlybereset
tozerounderprogramcontrol.
TheresidualvalueintheTimer/EventCounter,whichcannowbereadbytheprogram,therefore
representsthelengthofthepulsereceivedontheexternaltimerpin.Astheenablebithasnowbeen
reset,anyfurthertransitionsontheexternaltimerpinwillbeignored.Notuntiltheenablebitis
againsethighbytheprogramcanthetimerbeginfurtherpulsewidthmeasurements.Inthisway,
singleshotpulsemeasurementscanbeeasilymade.
ItshouldbenotedthatinthismodetheTimer/EventCounteriscontrolledbylogicaltransitions
ontheexternaltimerpinandnotbythelogiclevel.WhentheTimer/EventCounterisfulland
overflows,aninterruptsignalisgeneratedandtheTimer/EventCounterwillreloadthevaluealready
loadedintothepreloadregisterandcontinuecounting.Theinterruptcanbedisabledbyensuring
thattheTimer/EventCounterInterruptEnablebitintheInterruptControlRegister,INTC0,isreset
tozero.
AstheexternaltimerpinissharedwithanI/Opin,toensurethatthepinisconfiguredtooperateas
apulsewidthmeasurementpin,twothingshavetohappen.ThefirstistoensurethattheOperating
ModeSelectbitsintheTimerControlRegisterplacetheTimer/EventCounterinthePulseWidth
MeasurementMode,thesecondistoensurethattheportcontrolregisterconfiguresthepinasan
input.


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