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HT46R068B 数据表(PDF) 73 Page - Holtek Semiconductor Inc |
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HT46R068B 数据表(HTML) 73 Page - Holtek Semiconductor Inc |
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73 / 135 page  Rev. 1.50 7� �e���a�� 05� �015 Rev. 1.50 73 �e���a�� 05� �015 HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthevalue oftheADONBbit. AlthoughtheA/DclocksourceisdeterminedbythesystemclockfSYS,andbybitsADCS2, ADCS1andADCS0,therearesomelimitationsonthemaximumA/Dclocksourcespeedthatcan beselected.AstheminimumvalueofpermissibleA/Dclockperiod,tAD,is0.5μs,caremustbe takenforsystemclockspeedsinexcessof4MHz.Forsystemclockspeedsinexcessof4MHz,the ADCS2,ADCS1andADCS0bitsshouldnotbesetto"000".DoingsowillgiveA/Dclockperiods thatarelessthantheminimumA/DclockperiodwhichmayresultininaccurateA/Dconversion values.Refertothefollowingtableforexamples,wherevaluesmarkedwithanasterisk*show where,dependinguponthedevice,specialcaremustbetaken,asthevaluesmaybelessthanthe specifiedminimumA/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 � μs 8 μs 3� μs 1 μs 4 μs 16 μs Undefined �MHz 1 μs 4 μs 16 μs 500ns � μs 8 μs Undefined 4MHz 500ns � μs 8 μs 250ns* 1 μs 4 μs Undefined 8MHz 250ns* 1 μs 4 μs 125ns* 500ns � μs Undefined 1�MHz 167ns* 667ns �.67 μs 83ns* 333ns* 1 μs Undefined A/D Clock Period Examples A/D Input Pins AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortA,PortCandPortE.Bits PCR15~PCR0intheANCSR0andANCSR1registers,determinewhethertheinputpinsaresetup asnormalinput/outputpinsorwhethertheyaresetupasanaloginputs.Inthisway,pinscanbe changedunderprogramcontroltochangetheirfunctionfromnormalI/Ooperationtoanaloginputs andviceversa.Pull-highresistors,whicharesetupthroughregisterprogramming,applytotheinput pinsonlywhentheyareusedasnormalI/Opins,ifsetupasA/Dinputsthepull-highresistorswill beautomaticallydisconnected.NotethatitisnotnecessarytofirstsetuptheA/Dpinasaninputin thePAC,PCCandPECportcontrolregisterstoenabletheA/DinputaswhenthePCR15~PCR0 bitsenableanA/Dinput,thestatusoftheportcontrolregisterwillbeoverridden. Summary of A/D Conversion Steps ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/ Dconversionprocess. • Step1 SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCS2,ADCS1and ADCS0intheregister. • Step2 SelectwhichpinsaretobeusedasA/DinputsandconfigurethemasA/Dinputpinsbycorrectly programmingthePCR15~PCR0bitsintheANCSR0,ANCSR1registers. • Step3 EnabletheA/DbyclearingtheADONBintheACSRregistertozero. |
类似零件编号 - HT46R068B_15 |
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类似说明 - HT46R068B_15 |
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