Zilog ZUSBOPTS Manual de usuario descargar pdf (Pagina 271)

100

101

UM017105-0511 Directives

Zilog Developer Studio II – ZNEO™

User Manual

243

The .UNION directive has the following form:

[stag]

.UNION

[name_1] DS count1

[name_2]

DS count2

[tname]

.TAG stagx [count]

...

[name_n]

DS count3

[ssize]

.ENDSTRUCT [stag]

An example of the

.UNION directive usage is:

BYTES .STRUCT

B0 DS 1

B1 DS 1

B2 DS 1

B3 DS 1 

BSIZE .ENDSTRUCT BYTES

LONGBYTES .UNION

LDATA BLKL 1

BDATA .TAG BYTES

LSIZE .ENDSTRUCT LONGBYTES

.WITH and .ENDWITH Directives

Using the fully qualified names for fields within a structure can result in very long names.

The

.WITH directive allows the initial part of the name to be dropped.

The

.WITH and .ENDWITH directives have the following form:

.WITH name

; directives

.ENDWITH [name]

The identifier name may be the name of a previously defined

.STRUCT or .UNION, or an

ordinary label to which a structure has been attached using a

.TAG directive. It can also be

the name of an equate or label with no structure attached. Within the

.WITH section, the

assembler attempts to prepend “name.” to each identifier encountered, and selects the

modified name if the result matches a name created by the

.STRUCT, .UNION, or .TAG

directives.

The

.WITH directives can be nested, in which case the search is from the deepest level of

nesting outward. In the event that multiple names are found, a warning is generated and

the first such name is used.

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