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HT46R002 датащи(PDF) 44 Page - Holtek Semiconductor Inc

номер детали HT46R002
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
Logo HOLTEK - Holtek Semiconductor Inc

HT46R002 датащи(HTML) 44 Page - Holtek Semiconductor Inc

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Rev. 1.21
44
April 11, 2017
Rev. 1.21
45
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
+1
+2
+3
+4
Ti me r
Ex te rn al T MR
Pi n I npu t
T0 ON - w it h T0 EG =0
In te r nal C lo ck o r
Pr e sca le r Ou t put
In cr em en t
Ti me r C oun te r
Pr e sca le r Ou t p ut i s sa m p le d at e ve r y fa lli n g e d g e of T 1.
Pulse Width Capture Mode Timing Chart (T0EG=0)
Prescaler
BitsT0PSC2~T0PSC0oftheTMR0Cregistercanbeusedtodefineadivisionratiofortheinternal
clocksourceoftheTimer/EventCounterenablinglongertimeoutperiodstobeset.
PFD Function (for HT46R003)
TheProgrammableFrequencyDividerprovidesameansofproducingavariablefrequencyoutput
suitableforapplication,suchassomeinterfacesrequiringaprecisefrequencygenerator.
TheTimer/EventCounteroverflowsignalistheclocksourceforthePFDfunction,whichis
controlledbyPFDCbitinCTRL0.ForthisdevicetheclocksourcecancomefromTimer/Event
Counter0.Theoutputfrequencyiscontrolledbyloadingtherequiredvaluesintothetimerprescaler
andtimerregisterstogivetherequireddivisionratio.Thecounterwillbegintocount-upfromthis
preloadregistervalueuntilfull,atwhichpointanoverflowsignalisgenerated,causingboththePFD
outputstochangestate.Thenthecounterwillbeautomaticallyreloadedwiththepreloadregister
valueandcontinuecounting-up.IftheCTRL0registerhasselectedthePFDfunction,thenforPFD
outputtooperate,itisessentialforthePortAcontrolregisterPACtosetthePFDpinsasoutputs.
PA6mustbesethightoactivatethePFD.Theoutputdatabitscanbeusedastheon/offcontrolbit
forthePFDoutputs.NotethatthePFDoutputswillallbelowiftheoutputdatabitisclearedto
zero.
Ti me r Ov er fl ow
PF D Cl oc k
PA 6 Da ta
PF D Ou t put a t PA 6
PFD Function
I/O Interfacing
TheTimer/EventCounter,whenconfiguredtorunintheeventcounterorpulsewidthcapture
mode,requirestheuseofanexternaltimerpinforitsoperation.Asthispinisasharedpinitmust
beconfiguredcorrectlytoensurethatitissetforuseasaTimer/EventCounterinputpin.Thisis
achievedbyensuringthatthemodeselectsbitsintheTimer/EventCountercontrolregister,either
theeventcounterorpulsewidthcapturemode.AdditionallythecorrespondingPortControlRegister
bitmustbesethightoensurethatthepinissetasaninput.Anypull-highresistorconnectedtothis
pinwillremainvalidevenifthepinisusedasaTimer/EventCounterinput.


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