标签: flash引导程序

AmongthemanyfeaturesbuiltintoMicrochip’sEnhancedFLASHMicrocontrollerdevicesisthecapa-bilityoftheprogrammemorytoself-program.Thisveryusefulfeaturehasbeendeliberatelyincludedtogivetheusertheabilitytoperformbootloadingoperations.DeviceslikethePIC18F452aredesignedwithadesig-nated“bootblock”,asmallsectionofprotectablepro-grammemoryallocatedspecificallyforbootloadfirmware.ThisapplicationnotedemonstratesaverypowerfulbootloaderimplementationforthePIC16F87XAandPIC18Ffamiliesofmicrocontrollers.Thecodingforthetwodevicefamiliesisslightlydifferent;however,thefunctionalityisessentiallythesame.Thegoalsofthisimplementationstressamaximumperformanceandfunctionality,whilerequiringaminimumofcodespace.AN851AFLASHBootloaderforPIC16andPIC18DevicesAuthor:RossM.FoslerandFIGURE1:BOOTLOADERFUNCTIONALRodgerRicheyBLOCKDIAGRAMMicrochipTechnologyInc.BootloaderFirmwareRXTXINTRODUCTION……