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HT46R004 датащи(PDF) 44 Page - Holtek Semiconductor Inc

номер детали HT46R004
подробное описание детали  Cost-Effective A/D 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
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HT46R004 датащи(HTML) 44 Page - Holtek Semiconductor Inc

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HT46R004
Cost-Effective A/D 8-Bit OTP MCU
I/O Interfacing
TheTimer/EventCounter,whenconfiguredtorunintheeventcounterorpulsewidthcapture
mode,requirestheuseofanexternaltimerpinforitsoperation.Asthispinisasharedpinitmust
beconfiguredcorrectlytoensurethatitissetforuseasaTimer/EventCounterinputpin.Thisis
achievedbyensuringthatthemodeselectsbitsintheTimer/EventCountercontrolregister,either
theeventcounterorpulsewidthcapturemode.AdditionallythecorrespondingPortControlRegister
bitmustbesethightoensurethatthepinissetasaninput.Anypull-highresistorconnectedtothis
pinwillremainvalidevenifthepinisusedasaTimer/EventCounterinput.
Programming Considerations
Whenrunninginthetimermode,theinternalsystemclockisusedasthetimerclocksourceand
isthereforesynchronisedwiththeoveralloperationofthemicrocontroller.Inthismodewhen
theappropriatetimerregisterisfull,themicrocontrollerwillgenerateaninternalinterruptsignal
directingtheprogramflowtotherespectiveinternalinterruptvector.Forthepulsewidthcapture
mode,theinternalsystemclockisalsousedasthetimerclocksourcebutthetimerwillonlyrun
whenthecorrectlogicconditionappearsontheexternaltimerinputpin.Asthisisanexternal
eventandnotsynchronisedwiththeinternaltimerclock,themicrocontrollerwillonlyseethis
externaleventwhenthenexttimerclockpulsearrives.Asaresult,theremaybesmalldifferences
inmeasuredvaluesrequiringprogrammerstotakethisintoaccountduringprogramming.Thesame
appliesifthetimerisconfiguredtobeintheeventcountingmode,whichagainisanexternalevent
andnotsynchronisedwiththeinternalsystemortimerclock.
WhentheTimer/EventCounterisread,orifdataiswrittentothepreloadregister,theclockis
inhibitedtoavoiderrors,howeverasthismayresultinacountingerror,thisshouldbetakeninto
accountbytheprogrammer.Caremustbetakentoensurethatthetimersareproperlyinitialised
beforeusingthemforthefirsttime.Theassociatedtimerenablebitsintheinterruptcontrol
registermustbeproperlysetotherwisetheinternalinterruptassociatedwiththetimerwillremain
inactive.Theedgeselect,timermodeandclocksourcecontrolbitsintimercontrolregistermust
alsobecorrectlysettoensurethetimerisproperlyconfiguredfortherequiredapplication.Itis
alsoimportanttoensurethataninitialvalueisfirstloadedintothetimerregistersbeforethetimer
isswitchedon;thisisbecauseafterpower-ontheinitialvaluesofthetimerregistersareunknown.
Afterthetimerhasbeeninitialisedthetimercanbeturnedonandoffbycontrollingtheenablebitin
thetimercontrolregister.
WhentheTimer/EventCounteroverflows,itscorrespondinginterruptrequestflagintheinterrupt
controlregisterwillbeset.IftheTimer/EventCounterinterruptisenabledthiswillinturngenerate
aninterruptsignal.Howeverirrespectiveofwhethertheinterruptsareenabledornot,aTimer/Event
Counteroverflowwillalsogenerateawake-upsignalifthedeviceisinaPower-downcondition.This
situationmayoccuriftheTimer/EventCounterisintheEventCountingModeandiftheexternal
signalcontinuestochangestate.Insuchacase,theTimer/EventCounterwillcontinuetocount
theseexternaleventsandifanoverflowoccursthedevicewillbewokenupfromitsPower-down
condition.Topreventsuchawake-upfromoccurring,thetimerinterruptrequestflagshouldfirstbe
sethighbeforeissuingthe“HALT”instructiontoentertheSleepMode.


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logo
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