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HT82B42R Scheda tecnica(PDF) 34 Page - Holtek Semiconductor Inc

Il numero della parte HT82B42R
Spiegazioni elettronici  I/O MCU with USB Interface
Download  84 Pages
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82B42R Scheda tecnica(HTML) 34 Page - Holtek Semiconductor Inc

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HT82B42R/HT82B42RE
I/O MCU with USB Interface
+1
+2
+3
+4
Ti me r
Ex te rn al T im er
Pi n I npu t
T0 ON o r T1 ON
(w it h T0 E or T 1E =0 )
Pr es c al er O ut put
In c re me nt
Ti me r C oun te r
Pr es c al er O ut put i s sa mp le d at e ve ry fa lli ng edge o f T1 .
Pulse Width Capture Mode Timing Chart
I/O Interfacing
TheTimer/EventCounter,whenconfiguredtorunintheeventcounterorpulsewidthmeasurement
mode,requiretheuseoftheexternalTMR0andTMR1pinsforcorrectoperation.Asthesepins
aresharedpinstheymustbeconfiguredcorrectlytoensuretheyaresetupforuseasTimer/Event
CounterinputsandnotasanormalI/Opins.Thisisimplementedbyensuringthatthemodeselect
bitsintheTimer/EventCountercontrolregister,selecteithertheeventcounterorpulsewidth
measurementmode.AdditionallythePortControlRegisterbitsforthesepinsmustbesethighto
ensurethatthepinissetupasaninput.Anypull-highresistorconfigurationoptiononthesepinswill
remainvalidevenifthepinisusedasaTimer/EventCounterinput.
Programming Considerations
Whenconfiguredtoruninthetimermode,theinternalsystemclockisusedasthetimerclock
sourceandisthereforesynchronisedwiththeoveralloperationofthemicrocontroller.Inthismode
whentheappropriatetimerregisterisfull,themicrocontrollerwillgenerateaninternalinterrupt
signaldirectingtheprogramflowtotherespectiveinternalinterruptvector.Forthepulsewidth
measurementmode,theinternalsystemclockisalsousedasthetimerclocksourcebutthetimer
willonlyrunwhenthecorrectlogicconditionappearsontheexternaltimerinputpin.Asthisis
anexternaleventandnotsynchronisedwiththeinternaltimerclock,themicrocontrollerwillonly
seethisexternaleventwhenthenexttimerclockpulsearrives.Asaresult,theremaybesmall
differencesinmeasuredvaluesrequiringprogrammerstotakethisintoaccountduringprogramming.
Thesameappliesifthetimerisconfiguredtobeintheeventcountingmode,whichagainisan
externaleventandnotsynchronisedwiththeinternalsystemortimerclock.
WhentheTimer/EventCounterisread,orifdataiswrittentothepreloadregister,theclockis
inhibitedtoavoiderrors,howeverasthismayresultinacountingerror,thisshouldbetakeninto
accountbytheprogrammer.Caremustbetakentoensurethatthetimersareproperlyinitialised
beforeusingthemforthefirsttime.Theassociatedtimerenablebitsintheinterruptcontrol
registermustbeproperlysetotherwisetheinternalinterruptassociatedwiththetimerwillremain
inactive.Theedgeselecttimermodeandclocksourcecontrolbitsintimercontrolregistermust
alsobecorrectlysettoensurethetimerisproperlyconfiguredfortherequiredapplication.Itis
alsoimportanttoensurethataninitialvalueisfirstloadedintothetimerregistersbeforethetimer
isswitchedon;thisisbecauseafterpower-ontheinitialvaluesofthetimerregistersareunknown.
Afterthetimerhasbeeninitialisedthetimercanbeturnedonandoffbycontrollingtheenablebitin
thetimercontrolregister.Notethatsettingthetimerenablebithightoturnthetimeron,shouldonly
beexecutedafterthetimermodebitshavebeenproperlysetup.Settingthetimerenablebithigh
togetherwithamodebitmodification,mayleadtoimpropertimeroperationifexecutedasasingle
timercontrolregisterbytewriteinstruction.


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