Zilog Z8F0130 - Manual (Page 110)

Using the Integrated Development Environment UM013037-1212
86
Zilog Developer Studio II – Z8 Encore!
User Manual
short bf2:9;
long bf3:17;
} bf_struct;
the Normal setting sets aside 1 byte (the size of a char) for bf1 , 2 bytes (the size of a
short) for bf2 , and 4 bytes (the size of a long) for bf3 . This packing is sometimes easier to
use when writing both C and assembly code to access the same bit-field structures because
the sizes and offsets are more readily predictable. Finally, the
Backward Compatible set-
ting preserves a somewhat more complicated packing scheme that was used by the Z8
Encore! compiler before release 4.11.0. That previous scheme remains unchanged when
Backward Compatible is selected, except to correct a problem in the handling of mixed
bit-fields (that is, those in which bit-fields of different nominal types are included in the
same structure, as in the example above). If you have a legacy application in which you
access the same bit-fields using both C and assembly code, you must either use the
Back-
ward Compatible setting or rewrite your assembly code to access the bit-fields using one
of the new bit-field packing options.
C: Deprecated Page
For Assembly Only projects, the Deprecated page is not available.
The Deprecated page contains options from older releases of ZDS II that, because of issues
found in extended experience with those particular options across many applications, are
no longer recommended for use. Zilog strongly recommends that you not use these fea-
tures in new projects. If you have older projects that use these options, they will continue
to be supported as in previous applications. However, Zilog recommends removing them
from your projects over time to avoid the issues that have caused these features to be dep-
recated.
Note: