Zilog ZUSBOPTS Bedienungsanleitung PDF herunterladen (Seite 241)

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101

UM017105-0511 Address Spaces and Segments

Zilog Developer Studio II – ZNEO™

User Manual

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Segments

Segments are used to represent regions of memory. Only one segment is considered active

at any time during the assembly process. A segment must be defined before setting it as

the current segment. Every segment is associated with one and only one address space.

Predefined Segments

For convenience, the segments listed in Table 19 are predefined by the assembler.

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 ERAM space using the following directives:

DEFINE MYDATA,SPACE=ERAM

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 231. The SEG-

Table 19. Predefined Segments

Segment ID Space Alignment Type Contents

CODE EROM 2 bytes Relocatable Code

EROM_DATA EROM 1 byte Relocatable Constant data, tables, and strings

EROM_TEXT EROM 1 byte Relocatable Constant strings

ROM_DATA ROM 1 byte Relocatable Constant data, tables, and strings

ROM_TEXT ROM 1 byte Relocatable Constant strings

__VECTORS ROM 1 byte Absolute Interrupt vector table

NEAR_DATA RAM 1 byte Relocatable Initialized near data

NEAR_BSS RAM 1 byte Relocatable Uninitialized near data

NEAR_TEXT RAM 1 byte Relocatable Near strings

FAR_DATA RAM 1 byte Relocatable Initialized far data

FAR_BSS RAM 1 byte Relocatable Uninitialized far data

FAR_TEXT RAM 1 byte Relocatable Far strings

IOSEG IODATA 1 byte Relocatable I/O data

1 2 ... 236 237 238 239 240 241 242 243 244 245 246 ... 519 520

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