8051單片機所有Keil C51匯編偽指令和C語言關鍵字大全

作者	將狼才鯨
創建日期	2025-04-21

• CSDN閱讀地址：8051單片機所有Keil匯編偽指令和C語言關鍵字的詳細解釋

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• 8051單片機所有Keil匯編偽指令和C語言關鍵字的詳細解釋，在Keil已安裝文件夾D:\Keil_v5\C51\Hlp\里有英文文檔進行查閱，直接在文檔里進行搜索，然后用翻譯軟件翻譯即可，很多偽指令在網上搜不到解釋，還是得自己去翻閱原始文檔；

  • 具體相關的文檔是《uv4.chm（This User’s Guide describes the μVision? IDE & Debugger）》《c51.chm（The Keil Cx51 Compiler User’s Guide ）》《a51.chm（This Keil Assembler User’s Guide ）》《lx51.chm（The Keil LX51 Linker/Locator ）》
  • 在線網址是 https://www.keil.com/support/man_c51.htm ，在線文檔里面也能進行搜索；

• uv4.chm文檔里有Keil C51軟件的各種快捷鍵介紹、Keil自帶仿真器包含哪些功能

• lx51.chm包含一些匯編偽指令的解釋，如：

  • BIT, CODE, CONST, DATA, EBIT, ECONST, EDATA, IDATA, HCODE, HCONST, HDATA, XDATA, AT, BITADDRESSABLE, INBLOCK, INPAGE, INSEG, OFFS, OVERLAYABLE, BIT, BYTE, WORD, DWORD, PAGE, BLOCK, SEG, SEGMENTS, NOOVERLAY, OVERLAY, ASSIGN, NAME, NOAJMP, NOAMAKE, NOINDIRECTCALL, NOJMPTAB, NOTYPE, OBJECTCONTROLS, DISABLEWARNING, IXREF, NOCOMMENTS, NOLINES, NOMAP, NOPRINT, NOPUBLICS, NOSYMBOLS, PAGELENGTH, PAGEWIDTH, PRINT, PRINTCONTROLS, PURGE, WARNINGLEVEL
  • PATH, TMP, C51INC, C51LIB,
  • ASSIGN, BANKAREA, CLASSES, CODE, DISABLEWARNING, IBANKING, IXREF, MERGEPUBLICS, NAME, NOAJMP, NOAMAKE, NOCOMMENTS, NODEFAULTLIBRARY, NOINDIRECTCALL, NOJMPTAB, NOLINES, NOMAP, NOOVERLAY, NOPRINT, NOPUBLICS, NOSORTSIZE, NOSYMBOLS, NOTYPE, OBJECTCONTROLS, OVERLAY, PAGELENGTH, PAGEWIDTH, PRINT, PRINTCONTROLS, PUBLICSONLY, PURGE, RECURSIONS, REGFILE, REMOVEUNUSED, RESERVE, RTX51, RTX51TINY, SEGMENTS, SEGSIZE, SPLIT_XDATAGROUP, WARNINGLEVEL
  • ?BA? ?BI? ?CO? ?DT? ?FC? ?FD? ?ID? ?PD? ?PR? ?PR? ?XD?
  • ?B_PORT ?B_FIRSTBIT ?B_XDATAPORT ?B_FIRSTBIT SWITCHx
  • map文件介紹

• a51.chm包含一些匯編偽指令，如：

  • PATH TMP C51INC $IF $ELSE $ELSEIF $ENDIF $SET $RESET IF ELSE ELSEIF ENDIF
  • CASE COND DATE DEBUG DEFINE ECRM EJECT1 ELSE ELSEIF ENDIF ERRORPRINT GEN IF INCDIR INCLUDE2 LIST MACRO MOD_CONT MOD_MX51 MOD51 MPL NOAMAKE NOCASE NOCOND NODEBUG NOERRORPRINT NOGEN NOLINES NOLIST NOMACRO NOMOD51 NOMPL NOOBJECT NOPRINT NOREGISTERBANK NOSYMBOLS NOSYMLIST NOXREF OBJECT PAGELENGTH PAGEWIDTH PRINT REGISTERBANK REGUSE RESET RESTORE1 SAVE1 SET SYMBOLS SYMLIST TITLE XREF
  • A DPTR PC C AB R0–R7 AR0–AR7 PR0 PR1 EPTR
  • DATA BIT IDATA EDATA XDATA CODE
  • ALIGN EVEN ORG USING IF ELSEIF ELSE ENDIF DB DD DW DBIT DS DSB DSD DSW ENDP LABEL PROC EXTERN EXTRN NAME PUBLIC BSEG CSEG DSEG ISEG RSEG SEGMENT XSEG BIT CODE DATA EQU IDATA LIT1 SBIT SET SFR SFR16 XDATA __ERROR__ __WARNING__ END
  • MPL MACRO NOMPL NOMACRO
  • MACRO EXITM ENDM LOCAL REPT IRP IRPC
  • NUL & <> % ;; !
  • EVAL IF REPEAT SUBSTR WHILE
  • __A51__ __AX51__ __DATE__ __DATE2__ __FILE__ __KEIL__ __LINE__ __MOD_CONT__ __TIME__
  • H結尾十六進制，O結尾八進制，B結尾二進制
  • 操作符優先級
  • 其它51單片機指令集中的操作符有：
    • A AB ACALL ADD ADDC AJMP AND ANL AR0 AR1 AR2 AR3 AR4 AR5 AR6 AR7 BIT BITADDRESSABLE BLOCK BSEG C CALL CJNE CLR CMP CODE CPL CSEG DA DATA DB DBIT DEC DIV DJNZ | DPTR DS DSEG DW ELSE ELSEIF END ENDIF ENDM ENDP EQ EQU EXITM EXTRN GE GT HIGH IDATA IF INBLOCK INC INPAGE INSEG IRP IRPC ISEG JB JBC JC JE JG JLE JMP JNB JNC | JNE JNZ JSG JSGE JSL JSLE JZ LCALL LE LJMP LOCAL LOW LT MACRO MOD MOV MOVC MOVX MUL NAME NE NOP NOT NUL NUMBER OR ORG ORL OVERLAYABLE PAGE PC POP PUBLIC PUSH R0 | R1 R2 R3 R4 R5 R6 R7 REPT RET RETIv RL RLC RR RRC RSEG SEG SEGMENT SET SETB SHL SHR SJMP SUB SUBB SWAP UNIT USING XCH XCHD XDATA XOR XRL XSEG
    • AC ACCv B CY DPH DPL EA ES ET0 ET1 EX0 EX1 F0 IE IE0 IE1 | INT0 INT1 IT0 IT1 OV P P0 P1 P2 P3 PS PSW PT0 PT1 PX0 PX1 | RB8 RD REN RI RS0 RS1 RXD SBUF SCON SM0 SM1 SM2 SP T1 TB8 TCON | TF0 TF1 TH0 TH1 TI TL0 TL1 TMOD TO TR0 TR1 TXD WR
    • AT BYTE BYTE0 BYTE1 BYTE2 BYTE3 CONST DD DSB | DSD DSW DWORD ECALL ECODE EDATA EJMP EMOV EPTR | ERET EVEN EXTERN FAR HCONST HDATA LABEL LIT MBYTE | NEAR OFFS PR0 PR1 PROC WORD WORD0 WORD2

• c51.chm包含一些C語言關鍵字：

  • PATH TMP C51INC C51LIB
  • far sbit alien idata sfr bdata interrupt sfr16 bit large small code pdata compact using data reentrant xdata _at_ _task_ _priority_
  • program code bit bdata data far (const far) idata pdata xdata (const xdata)
  • Enum, signed short, unsigned short, signed int, unsigned int, signed long, unsigned long, Float, data *, idata *, pdata *, code*, xdata *, generic pointer,
  • _task_ _priority_
  • __C51__ __CX51__ __DATE__ __DATE2__ __FILE__ __LINE__ __MODEL__ __TIME__ __STDC__
  • ?C_IBP ?C_PBP ?C_XBP
  • 匯編與C語言函數間參數與返回值使用的是R0~R7里面哪些寄存器組成的形參
  • 一些C語言本來有的關鍵字：void char int enum float double signed unsigned short long const volatile auto register static extern #include #define Stringize(#) TokenPasting (##) defined(identifier)
  • #define #elif #else #endif #error #if #ifdef #ifndef #include #line #message #pragma #undef #warning
  • Keil提供的一些C語言標準庫函數和全局變量：calloc free _getkey init_mempool malloc putchar realloc jmp_buf size_t va_list wchar_t CBYTE CWORD DBYTE DWORD FARRAY FCARRAY FCVAR FVAR PBYTE PWORD XBYTE XWORD
  • memccpy memchr memcmp memcpy memmove memset isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit toascii toint tolower _tolower toupper _toupper abs atof atof517 atoi atol cabs labs strtod strtod517 strtol strtoul _chkfloat_ _crol_ _cror_ _irol_ _iror_ _nop_ _pop_ _push_ _testbit_ acos acos517 asin asin517 atan atan517 atan2 ceil cos cos517 cosh exp exp517 fabs floor fmod log log517 log10 log10517 modf pow rand sin sin517 sinh srand sqrt sqrt517 tan tan517 tanh _chkfloat_ _crol_ _cror_ _irol_ _iror_ _lrol_ _lror_ calloc free init_mempool malloc realloc getchar _getkey gets printf printf517 putchar puts scanf scanf517 sprintf sprintf517 sscanf sscanf517 ungetchar vprintf vsprintf strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strstr va_arg va_end va_start setjmp longjmp _nop_ _testbit_
  • 一些頭文件SFR_Definitions 80c517.h absacc.h assert.h ctype.h float.h intrins.h limits.h math.h rtx51tny.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h