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Cx51 User's Guide
Cx51 Introduction 
Compiling Programs 
Environment Settings Command Prompt ERRORLEVEL Output Files Listing (LST) File Object (OBJ) File Preprocessor (I) File Source (SRC) File Directives Directive List Reference AREGS ASM BROWSE BSE CODE COMPACT COND DEBUG DEFINE DISABLE EJECT ENDASM ENUMINT FARWARNING FIXXC800 FLOATFUZZY INCDIR INTERVAL INTPROMOTE INTVECTOR LARGE LISTINCLUDE MAXARGS MDU_F120 MDU_R515 MOD517 MODA2 MODAB2 MODC2 MODDA MODDP2 MODH2 MODP2 NOAMAKE NOAREGS NOCOND NOEXTEND NOINTPROMOTE NOINTVECTOR NOMDU_F120 NOMDU_R515 NOMOD517 NOMODA2 NOMODAB2 NOMODC2 NOMODDA NOMODDP2 NOMODH2 NOMODP2 NOOBJECT NOPREPROCESS NOPRINT NOREGPARMS OBJECT OBJECTADVANCED OBJECTEXTEND OMF2 ONEREGBANK OPTIMIZE ORDER PAGELENGTH PAGEWIDTH PREPRINT PRINT PSOC REGFILE REGISTERBANK REGPARMS RESTORE RET_PSTK RET_XSTK ROM SAVE SMALL SRC STRING SYMBOLS TABS USERCLASS VARBANKING WARNINGLEVEL XCROM Language Extensions Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference AppendixMODH2 Compiler Directive
| Abbreviation | None. |
| Arguments | None. |
| Default | Dual data pointers are not used. |
| µVision | Options — Target — Use multiple DPTR registers. |
| Description | The MODH2 directive instructs the compiler to produce code for the additional hardware components (specifically, the additional data pointers) available in several Hynix and ST uPSD 33xx and 34xx devices. Using additional data pointers improves the performance of the memcpy, memmove, memcmp, strcpy, and strcmp library routines. |
| See Also | |
| Example | C51 SAMPLE.C MODH2 #pragma modh2 |
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