Zilog Z8F0130 - Manual (Page 346)

Using the Macro Assembler UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
sizes, and the user must consult the appropriate operating system users guide for such
limitations.
•
The .$REPEAT and .$UNTIL directives must be coded in matching pairs. That is, it is
not legal to code a .$REPEAT directive without a matching .$UNTIL directive
appearing later in the source module nor is it legal to code an .$UNTIL directive with-
out a matching .$REPEAT directive appearing earlier in the source module.
•
The .$BREAK and .$CONTINUE assembler directives can only appear between
enclosing .$REPEAT and .$UNTIL directives (or between .$WHILE and .$WEND
directives). It is not valid for the .$BREAK and .$CONTINUE directives to appear in
any other context.
•
The .$BREAK directive has an optional .$IF conditional parameter.
•
The .$CONTINUE directive has an optional .$IF conditional parameter.
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None of the .$REPEAT , .$BREAK , . $CONTINUE , and .$UNTIL assembler directives
can be labeled. If a label is specified, a warning message is issued, and the label is dis-
carded.
WHILE Structured Assembly Block Inputs
The .$WHILE , .$BREAK , .$CONTINUE , and .$WEND assembler directives are used to test
execution-time conditions and conditionally execute object code based on the results of
the test.
Syntax
.$WHILE condition1 [; comment]
statements
[ .$BREAK [ .$IF condition2 ] [; comment ] ]
[ statements ]
[ .$CONTINUE [ .$IF condition3 ] [; comment ] ]
[ statements ]
.$WEND [; comment ]
The following qualifications elaborate the syntax and semantics of the structured assembly
test directives. Unless otherwise specified, violations of these qualifications cause the
assembly to fail.
•
The .$WHILE and .$WEND assembler directives must be specified in that order.
•
The .$BREAK assembler directive is optional. It can be specified an arbitrary number
of times between the .$WHILE and .$WEND assembler directives.