
UM017105-0511 Directives
Zilog Developer Studio II – ZNEO™
User Manual
241
YEAR DS 2
DSIZE
.ENDSTRUCT DATE
Directives allowed between .STRUCT and .ENDSTRUCT are directives that specify size,
principally
DS, ALIGN, ORG, and .TAG and their aliases. Also, BLKB, BLKW, and BLKL direc-
tives with one parameter are allowed because they indicate only size.
The following directives are not allowed within
.STRUCT and .ENDSTRUCT:
•
Initialization directives (DB, DW, DL, DF, and DD) and their aliases
•
BLKB, BLKW, and BLKL with two parameters because they perform initialization
•
Equates (EQU and SET)
•
Macro definitions (MACRO)
•
Segment directives (SEGMENT and FRAME)
•
Nested .STRUCT and .UNION directives
•
CPU instructions (for example, LD and NOP)
.TAG Directive
The .TAG directive declares or assigns a label to have a structure type. This directive can
also be used to define a structure/union element within a structure. The
.TAG directive
does not allocate memory; however, the
.TAG directive inside a structure reserves space in
the structure.
The
.TAG directive to define a structure/union element has the following form:
[stag]
.STRUCT [offset | : parent]
[name_1]
DS count1
[name_2]
DS count2
...
[tname]
.TAG stagx [count]
...
[ssize]
.ENDSTRUCT [stag]
The
.TAG directive to assign a label to have a structure type has the following form:
[tname]
.TAG stag ; Apply stag to tname
[tname]
DS ssize ; Allocate space for tname
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