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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT45F5R bảng dữ liệu(PDF) 57 Page - Holtek Semiconductor Inc |
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HT45F5R bảng dữ liệu(HTML) 57 Page - Holtek Semiconductor Inc |
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57 / 138 page  Rev. 1.10 5� De�e��e� 1�� �01� Rev. 1.10 57 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Pin-shared Functions Theflexibilityofthemicrocontrollerrangeisgreatlyenhancedbytheuseofpinsthathavemore thanonefunction.Limitednumbersofpinscanforceseriousdesignconstraintsondesignersbutby supplyingpinswithmulti-functions,manyofthesedifficultiescanbeovercome.Forthesepins,the desiredfunctionofthemulti-functionI/Opinsisselectedbyaseriesofregistersviatheapplication programcontrol. Pin-shared Function Selection Registers Thelimitednumberofsuppliedpinsinapackagecanimposerestrictionsontheamountoffunctionsa certaindevicecancontain.Howeverbyallowingthesamepinstoshareseveraldifferentfunctionsand providingameansoffunctionselection,awiderangeofdifferentfunctionscanbeincorporatedinto evenrelativelysmallpackagesizes.ThedeviceincludesPort"x"outputfunctionSelectionregister "n",labeledasPxSn,whichcanselectthedesiredfunctionsofthemulti-functionpin-sharedpins. Whenthepin-sharedinputfunctionisselectedtobeused,thecorrespondinginputandoutput functionsselectionshouldbeproperlymanaged.However,iftheexternalinterruptfunctionis selectedtobeused,therelevantoutputpin-sharedfunctionshouldbeselectedasanI/Ofunctionand theinterruptinputsignalshouldbeselected. Themostimportantpointtonoteistomakesurethatthedesiredpin-sharedfunctionisproperly selectedandalsodeselected.Toselectthedesiredpin-sharedfunction,thepin-sharedfunction shouldfirstbecorrectlyselectedusingthecorrespondingpin-sharedcontrolregister.Afterthatthe correspondingperipheralfunctionalsettingshouldbeconfiguredandthentheperipheralfunction canbeenabled.Tocorrectlydeselectthepin-sharedfunction,theperipheralfunctionshouldfirstbe disabledandthenthecorrespondingpin-sharedfunctioncontrolregistercanbemodifiedtoselect otherpin-sharedfunctions. Register Name Bit 7 6 5 4 3 2 1 0 PAS0 PAS07 PAS0� PAS05 PAS04 PAS0� PAS0� PAS01 PAS00 PAS1 PAS17 PAS1� PAS15 PAS14 PAS1� PAS1� PAS11 PAS10 PBS0 PBS07 PBS0� PBS05 PBS04 PBS0� PBS0� PBS01 PBS00 PBS1 PBS17 PBS1� PBS15 PBS14 PBS1� PBS1� PBS11 PBS10 PCS0 PCS07 PCS0� PCS05 PCS04 PCS0� PCS0� PCS01 PCS00 Pin-shared Function Selection Registers List PAS0 Register Bit 7 6 5 4 3 2 1 0 Na�e PAS07 PAS0� PAS05 PAS04 PAS0� PAS0� 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:PA3Pin-sharedfunctionselection 00:PA3 01:PA3 10:D- 11:AN2 Bit5~4 PAS05~PAS04:PA2Pin-sharedfunctionselection 00:PA2 01:PA2 10:PA2 11:AN1 |
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