Zilog ZUSBOPTS - Manual (Page 275)

UM017105-0511 Macros
Zilog Developer Studio II – ZNEO™
User Manual
247
<code_body>]

ENDIF
IFMA
Used only within a macro, this directive checks to determine if a macro argument has been
defined. If the argument is defined, the result is true. Otherwise, the result is false. If
<arg_number> is 0, the result is TRUE if no arguments were provided; otherwise, the
result is FALSE.
IFMA refers to argument numbers that are one based (that is, the first argument is numbered
one).
Syntax
IFMA <arg_number>

<code_body>

[ ELSE

<code_body>]

ENDIF
Macros
Macros allow a sequence of one or more assembly source lines to be represented by a sin-
gle assembler symbol. In addition, arguments can be supplied to the macro to specify or
alter the assembler source lines generated once the macro is expanded. The following sec-
tions describe how to define and invoke macros.
Macro Definition
A macro definition must precede the use of the macro. The macro name must be the same
for both the definition and the
ENDMACRO line. The argument list contains the formal argu-
ments that are substituted with actual arguments when the macro is expanded. The argu-
ments can be optionally prefixed with the substitution character (\) in the macro body.
During the invocation of the macro, a token substitution is performed, replacing the formal
arguments (including the substitution character, if present) with the actual arguments.
Note: