标签: icsp

INTRODUCTIONThetechnicalbriefdescribeshowtoimplementin-cir-cuitserialprogramming(ICSP™)usingthePIC12C5XXOTPPICmicro™MCU.ICSPisasimplewaytomanufactureyourboardwithanunprogrammedPICmicroandprogramthedevicejustbeforeshippingtheproduct.ProgrammingthePIC12C5XXMCUin-circuithasmanyadvantagesfordevelopingandmanufacturingyourproduct.•Reducesinventoryofproductswitholdfirmware.WithICSP,theusercanmanufactureproductwithoutprogrammingthePICmicroMCU.ThePICmicrowillbeprogrammedjustbeforetheproductisshipped.•ICSPinproduction.NewsoftwarerevisionsoradditionalsoftwaremodulescanbeprogrammedduringproductionintothePIC12C5XXMCU.•ICSPinthefield.Evenafteryourproducthasbeensold,aservicemancanupdateyourprogramwithnewprogrammodules.•Onehardwarewithdifferentsoftware.ICSPallowstheusertohaveonehardware,whereasthePIC12C5XXMCUcanbeprogrammedwithdifferenttypesofsoftware.•Lastminuteprogramming.Lastminutepro-grammingcanalsofacilitatequickturnaroundsoncustomordersforyourproducts.TB017HowtoImplementICSPUsingPIC12C5XXOTPMCUscustomordersforyourproducts.Author:ThomasSchmidtMicrochipTechnologyInc.IN-CIRCUITSERIALPROGRAMMINGToimplementICSPintoanapplication,theuserneedstoconsiderthreemaincomponentsofanICSPsystem:INTRODUCTIONApplicationCircuit,Prog……

Semiconductormanufacturershavedesignedseveraltypesofcircuitsupervisorswithvaryingtypesoffunc-tionalityoverthepastfewyears.Somesupervisorsincorporatewatchdogfeaturesaswellascomplexfunc-tions,suchasprogrammablethresholdlevels.Asitturnsout,mostsystemsupervisordatasheetsaddresstypicalsupervisorfunctionsrelatedtoPower-onReset,power-down,andbrown-outconditions.Inordertoserveawidecustomerbase,semiconductormanufac-turersshouldalsoaddresssystemsupervisorsdesignedintosystemswheremicrocontrollers(MCUs)andprogrammablelogicdevices(PLDs)arepro-grammedin-circuit.ProgrammingPICmicro®micro-controllersinthisfashionisknownasIn-CircuitSerialProgrammingTM(ICSPTM),whichcanbeimplementedforavarietyofreasons,includingfieldupgrades.MAN820SystemSupervisorsinICSPTMArchitecturesAuthor:KenDietzCIRCUITRYBACKGROUNDMicrochipTechnologyInc.MCP120OutputStageAsimplifiedschematicfortheMCP120outputstageisshowninFigure1.Nominally,theoutputstageoftheMCP120canhandlesinkinglessthan1mAofcurrentINTRODUCTIONinahighimpedancestat……