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C251 User's Guide
C251 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 ASM ASMEXPAND BROWSE CODE COND DEBUG DEFINE DISABLE EJECT ENDASM FIXDRK FLOAT64 FLOATFUZZY FUNCTIONS HOLD HPTR INCDIR INTERVAL INTR2 INTVECTOR LARGE LISTINCLUDE MAXARGS MODBIN NAME NOALIAS NOAMAKE NOASMEXPAND NOCASE NOCOND NOEXTEND NOINTVECTOR NOOBJECT NOPRINT NOREGPARMS NVM_CONST OBJECT OBJECTADVANCED OPTIMIZE ORDER PACK PAGELENGTH PAGEWIDTH PARM251 PARM51 PREPRINT PREPRINTONLY PRINT REGFILE REGPARMS RENAMECODE RESTORE ROM SAVE SMALL SRC STRING SYMBOLS TABS TINY UNSIGNED_CHAR USERCLASS WARNING WARNINGLEVEL XSMALL XTINY Language Extensions Preprocessor Advanced Programming Error Messages Library Reference AppendixINTR2 Compiler Directive
| Abbreviation | I2 |
| Arguments | None. |
| Default | The C251 compiler assumes that an interrupt pushes 4 bytes onto the stack: a 24-bit return address and PSW1. |
| µVision | Options — C251 Compiler — Object — Save PSW1 in interrupt code. |
| Description | The INTR2 directive informs the C251 compiler that the 251 CPU saves the low order 16 bits of the program counter but does not automatically save PSW1 when entering an interrupt. When INTR2 is used, the C251 compiler generates code that manually saves and restores the PSW1 register in interrupt functions. You must use this directive if you want 8051 compatible behavior. |
| Example | C251 SAMPLE.C INTR2 #pragma i2 |
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