Zilog Z8F0130 - Manual (Page 374)

Using the Linker/Locator UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
able. The predefined space NULL can also be used to prevent initialization of data while
reserving the segment in the original space using the COPY command.
Examples
Example 1
To make a copy of a data segment in ROM, use the following procedure:
1. In the assembly code, define a data segment (for example, dataseg ) to be a segment
located in RDATA. This is the run-time location of dataseg .
2. Use the following linker command:
COPY dataseg ROM
The linker places the actual contents associated with dataseg in ROM (the load time
location) and associates RDATA (the run-time location) addresses with labels in
dataseg .
You must copy the dataseg contents from ROM to RDATA at run time as part of the start-
up routine. You can use the COPY BASE OF and COPY TOP OF linker expressions to get
the base address and top address of the contents in ROM. You can use the BASE OF and
TOP OF linker expressions to get the base address and top address of
dataseg .
Example 2
To copy multiple segments to ROM, use the following procedure:
1. In the assembly code, define the segments (for example, strseg , text , and
dataseg ) to be segments located in RDATA. This is the run-time location of the seg-
ments.
2. Use the following linker commands:
CHANGE strseg=dataseg

CHANGE text=dataseg

COPY dataseg ROM
The linker renames strseg and text as dataseg and performs linking as described
in the previous example. You must write only one loop to perform the copy from
ROM to RDATA at run time, instead of three (one loop each for
strseg , text , and
dataseg ).
Example 3
To allocate a string segment in ROM but not generate the initialization:
Note: