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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 AppendixONEREGBANK Compiler Directive
| Abbreviation | OB |
| Arguments | None. |
| Default | None. |
| µVision | Options — C51 — Misc controls. |
| Description | The C51 Compiler selects registerbank 0 on entry to interrupts that do not specify the using attribute. This is done at the beginning of the interrupt service routine with the MOV PSW,#0 instruction. This ensures that high-priority interrupts that do not use the using attribute can interrupt lower priority interrupts that use a different registerbank. If your application uses only one registerbank for interrupts, you may use the ONEREGBANK directive. This elimitates the MOV PSW,#0 instruction. |
| Example | C51 SAMPLE.C ONEREGBANK #pragma OB |
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