Zilog ZUSBOPTS - Manual (Page 276)

Macros UM017105-0511
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Zilog Developer Studio II – ZNEO™
User Manual
Syntax
<macroname>[:] MACRO [<arg>(,<arg>)...]

<macro_body>

ENDMAC [RO]<macroname>
Example
store: MACRO reg1,reg2,reg3

ADD reg1,reg2

LD reg3,reg1

ENDMAC store
The following example contains a subtle error:
BadMac MACRO a,b,c
DL a,b,c
MACEND BadMac
Recall that b and c are reserved words on ZNEO, used for condition codes on the JP
instruction. Thus, they cannot be used as macro arguments. To avoid this and similar
errors, it is recommended that you avoid single character names.
Concatenation
To facilitate unambiguous symbol substitution during macro expansion, the concatenation
character (&) can be suffixed to symbol names. The concatenation character is a syntactic
device for delimiting symbol names that are points of substitution and is devoid of seman-
tic content. The concatenation character, therefore, is discarded by the assembler, when
the character has delimited a symbol name. For example:
val_part1 equ 55h
val_part2 equ 33h
The assembly is:
value macro par1, par2
DB par1&_&par2
macend
value val,part1
value val,part2
The generated list file is:
A 9 value val,part1
000000 55 A+ 9 DB val_part1
A+ 9 macend
A 10 value val,part2
000001 33 A+ 10 DB val_part2
Note: