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Ax51 User's Guide
Ax51 Introduction Assembling Programs Writing Assembly Programs Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting a Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes C Preprocessor Exceptions Side-Effects Predefined Macros Examples Error Messages AppendixExiting a Macro
The EXITM directive immediately terminates a macro expansion. When this directive is detected, the macro processor stops expanding the current macro and resumes processing after the next ENDM directive. The EXITM directive is useful in conditional statements. For example:
WAIT MACRO X ; macro definition
IF NUL X ; make sure X has a value
EXITM ; if not then exit
ENDIF
REPT X ; generate X NOP instructions
NOP
ENDM ; end REPT
ENDM ; end MACRO
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