Zilog Z8F0130 - Manual (Page 304)

Using the Macro Assembler UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
The predefined segment text is generated by the compiler, which moves it to either the
near_data or far_data segment, depending on the memory model that is in use. See
the Memory Models section on page 199.
For every vector directive that locates an interrupt vector at address nnn (where n repre-
sents a hexadecimal digit), the assembler generates an absolute segment in ROM named
__vectors_ nnn.


The
pramseg segment is available only for the subset of Z8 Encore! CPUs that support
the PRAM (Program RAM) address space.
User-Defined Segments
You can define a new segment using the following directives:
DEFINE MYSEG,SPACE=ROM

SEGMENT MYSEG
MYSEG becomes the current segment when the assembler processes the SEGMENT direc-
tive, and MYSEG remains the current segment until a new SEGMENT directive appears.
MYSEG can be used as a segment name in the linker command file.
You can define a new segment in RAM using the following directives:
DEFINE MYDATA,SPACE=RDATA

SEGMENT MYDATA
or
DEFINE MYDATA,SPACE=EDATA

SEGMENT MYDATA
The DEFINE directive creates a new segment and attaches it to a space. For more informa-
tion about using the DEFINE directive, see the DEFINE section on page 301. The SEG -
MENT directive attaches code and data to a segment. The SEGMENT directive makes that
segment the current segment. Any code or data following the directive resides in the seg-
ment until another
SEGMENT directive is encountered. For more information about the
SEGMENT directive, see the SEGMENT section on page 307.
A segment can also be defined with a boundary alignment and/or origin.
•
Alignment
Aligning a segment tells the linker to place all instances of the segment in your pro-
gram on the specified boundary.
Notes: