标签: pic16f87x

美国微芯公司研制的PIC系列单片机，其硬件结构和指令系统采用了与众不同的设计手法。在架构上和概念上对传统单片机进行了一些突破性的变革，但也给这类单片机的应用带来了一些特殊问题。本文针对PIC16F87X系列单片机中断的特点，及其在应用过程中应该注意的几个问题进行必要的说明。内容包括中断源、中断逻辑、中断相关的寄存器、中断的延时、中断的现场保护以及注意事项等。……

第1章PIC16F87X简介第2章PIC16F87X单片机结构第3章存储器结构第4章单片机核心探讨第5章输入输出端口第6章定时器模块与CCP模块第7章模拟数字转换器模块第8章同步串行端口模块第9章通用同步异步接收发送器模块第10章PIC16F87X指令集第11章MPASM汇编语言第12章MPLAB-ICD……

PIC16F87X8位CMOSFlash单片机……

Manyapplicationsrequirethemicrocontrollertocal-culateachecksumontheprogrammemorytodeter-mineifthecontentshavebeencorrupted.Untilnow,theonlyfamilyofPICmicro®microcontrollerstohavethecapabilitytoreadfromprogrammemoryarethePIC17CXXXdevices.ThePIC16F87Xdevicesarethefirst14-bitcorePICmicromicrocontrollersthatareabletoaccessprogrammemoryinthesamefashionasusedwithdataEEPROMmemory.ThesedevicesareFLASHextensionsofthepopularPIC16C7Xfamily.Table1showsacomparisonbetweenthetwoPICmicromicrocontrollerfamilies.MCalculatingProgramMemoryChecksumsUsingaPIC16F87XTB026ACCESSINGMEMORYAuthor:RodgerRicheyMicrochipTechnologyInc.ThedataEEPROMandFLASHProgrammemoryarebothaccessedusingthesamemethod.Anaddressand/ordatavaluearestoredinSpecialFunctionReg-isters(SFR)andthenmemoryisaccessedusingcon-INTRODUCTIONtrolbitsinotherSFRs.TherearesixSFRsrequiredtoMany……

ThePIC16F87Xfamilyofmicrocontrollershastheabil-itytowritetotheirownprogrammemory.Thisfeatureallowsasmallbootloaderprogramtoreceiveandwritenewfirmwareintomemory.Thisapplicationnoteexplainshowthiscanbeimplementedanddiscussesthefeaturesthatmaybedesirable.AN732ImplementingaBootloaderforthePIC16F87XAuthor:MikeGarbuttOPERATIONMicrochipTechnologyInc.Thebootcodebeginsbycheckingtoseeifthereisnewusercodetobedownloaded.Ifnot,itstartsrunningtheexistingusercode.IfthereisnewusercodetobeINTRODUCTIONdownloaded,thebootcodereceivesandwritestheThePIC16F87Xfamilyofmicrocontrollershastheabil-dataintoprogram……

ThePIC16F87X(Rev.B5)partsyouhavereceivedconformfunctionallytotheDeviceDataSheet(DS30292A),exceptfortheanomaliesdescribedbelow.AlltheproblemslistedherewillbeaddressedinfuturerevisionsofthePIC16F87Xsilicon.ThiserrataappliestothePIC16F877-20/Pproductionversionwithanassemblydatecodeof9925orgreaterandallotherproductionversionsofthePIC16F87Xfamily.PIC16F87XPIC16F87XRev.B5SiliconErrataSheetThePIC16F87X(Rev.B5)partsyouhavereceived3.Module:TMR1conformfunctionallytotheDeviceDataSheetWhenoperatinginexternalclockmode(TMR1CS(DS30292A),exceptfortheanomaliesdescribedisset),readingeitherofthetimer1registersbelow.(TMR1HorTMR1L)maycausethetimernottoAlltheproblemslistedherewillbeaddressedinfutureincrementasexpected.Thisoccursforbothsyn-revisionsofthePIC16F87Xsilicon.chronousand……

ThePIC16F87Xfamily(Rev.B8)partsyouhavereceivedconformfunctionallytotheDeviceDataSheet(DS30292C),exceptfortheanomaliesdescribedbelow.AnyDataSheetClarificationissuesrelatedtothePIC16F87XfamilywillbereportedinaseparateDataSheeterrata.PleasechecktheMicrochipwebsiteforanyexistingissues.PIC16F87XPIC16F87XFamilyRev.B8SiliconErrataThePIC16F87Xfamily(Rev.B8)partsyouhave2.Module:Capture/Compare/PWMModulesreceivedconformfunctionallytotheDeviceDataSheet(DS30292C),exceptfortheanomaliesdescribedWhilechangingthemodeofthemodule,whenbelow.AnyDataSheetClarificationissuesrelatedtotheCCPxCONisloadedwith0x08,theCCPxpinisPIC16F87XfamilywillbereportedinaseparateDatanotpulledLOWasexpected.Sheeterrata.PleasechecktheMicrochipwebsiteforWorkaroundanyexistingissues.Whenchangingthemodeofthemodule,resetthe……

ThePIC16F87X(Rev.B3)partsyouhavereceivedconformfunctionallytotheDeviceDataSheet(DS30292A),exceptfortheanomaliesdescribedbelow.AlltheproblemslistedherewillbeaddressedinfuturerevisionsofthePIC16F87Xsilicon.ThiserrataappliestoallPIC16F877-20/Pproductiondevicesmarkedwithanassemblydatecodepriorto9925.4.PIC16F87XPIC16F87XRev.B3SiliconErrataSheetThePIC16F87X(Rev.B3)partsyouhavereceived4.Module:TMR1conformfunctionallytotheDeviceDataSheetWhenoperatinginexternalclockmode(TMR1CS(DS30292A),exceptfortheanomaliesdescribedisset),readingeitherofthetimer1registersbelow.(TMR1HorTMR1L)maycausethetimernottoAlltheproblemslistedherewillbeaddressedinfutureincrementasexpected.Thisoccursforbothsyn-revisionsofthePIC16F87Xsilicon.chronousand……

ThePIC16F87X(Rev.B)partsyouhavereceivedcon-formfunctionallytotheDeviceDataSheet(DS30292A),exceptfortheanomaliesdescribedbelow.AlltheproblemslistedherewillbeaddressedinfuturerevisionsofthePIC16F87Xsilicon.Alldeviceshavebeenmarkedrevision“B”and“engi-neeringsample”or“ES”.PIC16F87XPIC16F87XRev.BSiliconErrataSheetThePIC16F87X(Rev.B)partsyouhavereceivedcon-1.Module:ProgramMemoryformfunctionallytotheDeviceDataSheetWheninstructionexecutionresumesafteraninter-(DS30292A),exceptfortheanomaliesdescribednalprogramcycleterminates,thefollowing16below.memorylocationsmustbeblank(all1’s).Other-Alltheproblemslistedherewillbeaddressedinfuturewisethismaycauseunexpecteddeviceoperation.revisionsofthePIC16F87Xsilicon.WorkAroundAlldeviceshavebeenmarkedrevision“B”and“en……