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RealView Assembler User's Guide
Preface Introduction Writing ARM Assembly Language Assembler Reference ARM and Thumb Instructions 
Directives Reference 
Alphabetical list of directives Symbol definition directives GBLA, GBLL, and GBLS LCLA, LCLL, and LCLS SETA, SETL, and SETS RELOC RN RLIST CN CP Data definition directives LTORG MAP FIELD SPACE or FILL DCB DCD and DCDU DCDO DCFD and DCFDU DCFS and DCFSU DCI DCQ and DCQU DCW and DCWU COMMON DATA Assembly control directives Nesting directives MACRO and MEND MEXIT IF, ELSE, ENDIF, and ELIF WHILE and WEND Frame directives FRAME ADDRESS FRAME POP FRAME PUSH FRAME REGISTER FRAME RESTORE FRAME RETURN ADDRESS FRAME SAVE FRAME STATE REMEMBER FRAME STATE RESTORE FRAME UNWIND ON FRAME UNWIND OFF FUNCTION or PROC ENDFUNC or ENDP Reporting directives ASSERT INFO OPT TTL and SUBT Instruction set and syntax selection directives ARM, THUMB, THUMBX, CODE16 and CODE32 Miscellaneous directives ALIGN AREA ATTR END ENTRY EQU EXPORT or GLOBAL EXPORTAS GET or INCLUDE IMPORT and EXTERN INCBIN KEEP NOFP REQUIRE REQUIRE8 and PRESERVE8 ROUTRN
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The RN directive defines a register name for a specified register.
nameRNexpr
where:
nameis the name to be assigned to the register.
nameexprevaluates to a register number from 0 to 15.
Use RN to allocate convenient names to registers, to help you to remember what you use each register for. Be careful to avoid conflicting uses of the same register under different names.
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