一个led闪烁的代码

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1、$NOMOD51;------------------------------------------------------------------------------;ThisfileispartoftheC51Compilerpackage;Copyright(c)1988-2005KeilElektronikGmbHandKeilSoftware,Inc.;Version8.01;;***<<>>***;------------------------------

2、------------------------------------------------;STARTUP.A51:Thiscodeisexecutedafterprocessorreset.;;TotranslatethisfileuseA51withthefollowinginvocation:;;A51STARTUP.A51;;TolinkthemodifiedSTARTUP.OBJfiletoyourapplicationusethefollowing;Lx51invocation:;;Lx51yourobjectfilelist,S

3、TARTUP.OBJcontrols;;------------------------------------------------------------------------------;;User-definedPower-OnInitializationofMemory;;WiththefollowingEQUstatementstheinitializationofmemory;atprocessorresetcanbedefined:;;IDATALEN:IDATAmemorysize<0x0-0x100>;No

4、te:Theabsolutestart-addressofIDATAmemoryisalways0;TheIDATAspaceoverlapsphysicallytheDATAandBITareas.IDATALENEQU80H;;XDATASTART:XDATAmemorystartaddress<0x0-0xFFFF>;TheabsolutestartaddressofXDATAmemoryXDATASTARTEQU0;;XDATALEN:XDATAmemorysize<0x0-0xFFFF>;Thelengtho

5、fXDATAmemoryinbytes.XDATALENEQU0;;PDATASTART:PDATAmemorystartaddress<0x0-0xFFFF>;TheabsolutestartaddressofPDATAmemoryPDATASTARTEQU0H;;PDATALEN:PDATAmemorysize<0x0-0xFF>;ThelengthofPDATAmemoryinbytes.PDATALENEQU0H;;;----------------------------------------------

6、--------------------------------;;ReentrantStackInitialization;;ThefollowingEQUstatementsdefinethestackpointerforreentrant;functionsandinitializedit:;;StackSpaceforreentrantfunctionsintheSMALLmodel.;IBPSTACK:EnableSMALLmodelreentrantstack;Stackspaceforreentrantfunc

7、tionsintheSMALLmodel.IBPSTACKEQU0;setto1ifsmallreentrantisused.;IBPSTACKTOP:EndaddressofSMALLmodelstack<0x0-0xFF>;Setthetopofthestacktothehighestlocation.IBPSTACKTOPEQU0xFF+1;default0FFH+1;;;StackSpaceforreentrantfunctionsintheLARGEmodel.;XBPSTACK:EnableLARGEmo

8、delreentrantstack;StackspaceforreentrantfunctionsintheLARG