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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F2020 датащи(PDF) 40 Page - Holtek Semiconductor Inc |
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HT45F2020 датащи(HTML) 40 Page - Holtek Semiconductor Inc |
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40 / 85 page  Rev. 1.00 40 April 11, 2017 Rev. 1.00 41 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Pin-shared Functions Theflexibilityofthemicrocontrollerrangeisgreatlyenhancedbytheuseofpinsthathavemore thanonefunction.Limitednumbersofpinscanforceseriousdesignconstraintsondesignersbutby supplyingpinswithmulti-functions,manyofthesedifficultiescanbeovercome.Forthesepins,the desiredfunctionofthemulti-functionI/Opinsisselectedbytheapplicationprogramcontrol. Pin-shared Function Selection Registers Thelimitednumberofsuppliedpinsinapackagecanimposerestrictionsontheamountoffunctions acertaindevicecancontain.Howeverbyallowingthesamepinstoshareseveraldifferentfunctions andprovidingameansoffunctionselection,awiderangeofdifferentfunctionscanbeincorporated intoevenrelativelysmallpackagesizes.ThedeviceincludesPortAoutputfunctionselection register“n”,labeledasPASn,whichcanselectthedesiredfunctionsofthemulti-functionpin-shared pins. Whenthepin-sharedinputfunctionisselectedtobeused,thecorrespondinginputandoutput functionsselectionshouldbeproperlymanaged. Themostimportantpointtonoteistomakesurethatthedesiredpin-sharedfunctionisproperly selectedandalsodeselected.Toselectthedesiredpin-sharedfunction,thepin-sharedfunction shouldfirstbecorrectlyselectedusingthecorrespondingpin-sharedcontrolregister.Afterthatthe correspondingperipheralfunctionalsettingshouldbeconfiguredandthentheperipheralfunction canbeenabled.Tocorrectlydeselectthepin-sharedfunction,theperipheralfunctionshouldfirstbe disabledandthenthecorrespondingpin-sharedfunctioncontrolregistercanbemodifiedtoselect otherpin-sharedfunctions. PAS0 Register Bit 7 6 5 4 3 2 1 0 Name PAS07 PAS06 PAS05 PAS04 PAS03 PAS02 PAS01 PAS00 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit7~6 PAS07~PAS06:PA3pinfunctionselection 0x:PA3 10:PTP 11:PTPB Bit5~4 PAS05~PAS04:PA2pinfunctionselection 00:PA2/PTCK 01:PA2/PTCK 10:PA2/PTCK 11:PA2/PTCK Bit3~2 PAS03~PAS02:PA1pinfunctionselection 0x:PA1 10:PTP 11:PTPB Bit1~0 PAS01~PAS00:PA0pinfunctionselection 00:PA0/PTPI 01:PA0/PTPI 10:PA0/PTPI 11:PA0/PTPI |
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