05 Data EEPROM

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1、Section5.DataEEPROMHIGHLIGHTSThissectionofthemanualcontainsthefollowingmajortopics:5.1Introduction....................................................................................................................5-25.2ControlRegisters............................................................

2、...............................................5-25.3DataEEPROMOperations............................................................................................5-45.4RegisterMap..................................................................................................................

3、5-95.5DesignTips..................................................................................................................5-105.6RelatedApplicationNotes............................................................................................5-115.7RevisionHistory......................

4、.....................................................................................5-125EEPROMData©2007MicrochipTechnologyInc.AdvanceInformationDS39720A-page5-1PIC24FFamilyReferenceManual5.1INTRODUCTIONInadditiontostandardFlash-basedprogrammemoryandvolatiledataRAM,certainPIC24Fdevicesalsoinclu

5、deon-chipdataEEPROM.Thismemoryblockallowsuserstostoreprogramorapplicationinformation(suchasidentification,calibrationconstants,etc.)inanonvolatileloca-tion,andeasilyrewritetheinformationwhenneeded.DataEEPROMmemoryisbasedonthesameFlashtechnologyasprogrammemory,andhasbeenoptimizedforbothlongretent

6、ionandahighernumberoferase/writecycles.ThedataEEPROMismappedtothetopoftheuserprogrammemoryspace,withthetopaddressatprogrammemoryaddress7FFFFFh.ThesizeoftheEEPROMisdevicedependent.Refertothespecificdevicedatasheetforfurtherinformation.TheEEPROMisorganizedas16-bitwidememory.Eachwordisdirectlyaddre

7、ssable;unlikeprogrammemory,thereareno“phantombytes”inodd-numberedaddresses.TheprogrammingtechniquesusedforthedataEEPROMaresimilartothoseusedforFlashprogrammemoryRTSP,discussedinprevioussections.ThekeydifferencesbetweenFlasha