Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 269)

100

101

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

Note:

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