12 IO Ports with Peripheral Pin Select (PPS)...

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1、Section12.I/OPortswithPeripheralPinSelect(PPS)Thissectionofthemanualcontainsthefollowingtopics:12.1Introduction......................................................................................................................21212.2I/OPortControlRegisters..

2、..............................................................................................212.3PeripheralMultiplexing.....................................................................................................712.4PeripheralPinSelect...............

3、.........................................................................................9I/OPorts12.5PortDescriptions............................................................................................................1912.6ChangeNotification(CN)Pins...

4、....................................................................................1912.7RegisterMaps................................................................................................................2112.8RelatedApplicationNotes..................

5、............................................................................2212.9RevisionHistory.............................................................................................................23©2007MicrochipTechnologyInc.AdvanceInformationDS39711

6、B-page12-1Section12.I/OPorts12.1INTRODUCTIONThegeneralpurposeI/Opinscanbeconsideredthesimplestofperipherals.TheyallowthePIC®MCUtomonitorandcontrolotherdevices.Toaddflexibilityandfunctionalitytoadevice,somepinsaremultiplexedwithalternatefunction(s).Thesefunction

7、sdependonwhichperipheralfeaturesareonthedevice.Ingeneral,whenaperipheralisfunctioning,thatpinmaynotbeusedasageneralpurposeI/Opin.MostofthePIC24FfamilydevicessupportthePeripheralPinSelect(PPS)feature.ThePPSconstitutespinswhichuserscanmaptotheinputand/oroutputofs

8、omedigitalperipherals.Figure12-1showsablockdiagramofatypicalI/Oport.ThisblockdiagramdoesnottakeintoaccountperipheralfunctionsthatmaybemultiplexedontotheI/Opin.12Figure12-1:D