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HT46R002 датащи(PDF) 53 Page - Holtek Semiconductor Inc |
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HT46R002 датащи(HTML) 53 Page - Holtek Semiconductor Inc |
53 / 83 page Rev. 1.21 52 April 11, 2017 Rev. 1.21 53 April 11, 2017 HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU PCR3~PCR0 Bits HALT Instruction ADONB Bit ADC On/Off =0 X X Off > 0 X 0 On > 0 X 1 Off "X": Don’t care A/D Converter On/Off Control AlthoughtheA/DclocksourceisdeterminedbythesystemclockfSYS,andbybitsADCK2~ADCK0, therearesomelimitationsonthemaximumA/Dclocksourcespeedthatcanbeselected.Asthe recommendedrangeofpermissibleA/Dclockperiod,tAD,isfrom0.5μsto10μs,caremustbetaken forsystemclockfrequencies.Forexample,ifthesystemclockoperatesatafrequencyof2MHzor 4MHz,theADCS2~ADCS0bitsshouldnotbesetto010Bor100Brespectively.Doingsowillgive A/DclockperiodsthatarelessthantheminimumA/DclockperiodorgreaterthanthemaximumA/D clockperiodwhichmayresultininaccurateA/Dconversionvalues. Refertothefollowingtableforexamples,wherevaluesmarkedwithanasterisk*showwhere, dependinguponthedevice,specialcaremustbetaken,asthevaluesmaybelessthanthespecified minimumA/DClockPeriod. fSYS A/D Clock Period(tAD) ADCS2, ADCS1, ADCS0 =000 (fSYS/2) ADCS2, ADCS1, ADCS0 =001 (fSYS/8) ADCS2, ADCS1, ADCS0 =010 (fSYS/32) ADCS2, ADCS1, ADCS0 =100 (fSYS) ADCS2, ADCS1, ADCS0 =101 (fSYS/4) ADCS2, ADCS1, ADCS0 =110 (fSYS/16) ADCS2, ADCS1, ADCS0 =011,111 1MHz 2μs 8μs 32μs* 1μs 4μs 16μs* Undefined 2MHz 1μs 4μs 16μs* 500ns 2μs 8μs Undefined 4MHz 500ns 2μs 8μs 250ns* 1μs 4μs Undefined 8MHz 250ns* 1μs 4μs 125ns* 500ns 2μs Undefined 12MHz 167ns* 667ns 2.67μs 83ns* 333ns* 1μs Undefined A/D Clock Period Examples A/D Input Pins AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortA.BitsPCR3~PCR0in theADCRregisterdeterminewhethertheinputpinsaresetasnormalinput/outputpinsorwhether theyaresetasanaloginputs.Inthisway,pinscanbechangedunderprogramcontroltochangetheir functionfromnormalI/Ooperationtoanaloginputsandviceversa.Pull-highresistors,whichare setthroughregisterprogramming,applytotheinputpinsonlywhentheyareusedasnormalI/O pins,ifsetasA/Dinputsthepull-highresistorswillbeautomaticallydisconnected.Notethatitis notnecessarytofirstsettheA/DpinasaninputintheI/OportcontrolregisterstoenabletheA/D inputaswhenthePCR3~PCR0bitsenableanA/Dinput,thestatusoftheportcontrolregisterwill beoverridden. |
Аналогичный номер детали - HT46R002 |
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Аналогичное описание - HT46R002 |
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