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Technical Support
On-Line Manuals
BL51 User's Guide
BL51 Introduction
Purpose of the Linker
Combining Modules
Searching Libraries
Combining Segments
Locating Segments
Overlaying Data Memory
Resolving External References
Calculating Addresses
Generating an Object File
Generating a Listing File
Segments
Memory Areas
BIT, DATA, and IDATA
CODE and CONST
XDATA
Linking Programs
Locating Segments
Data Overlaying
Code Banking
Real-Time Programs
Error Messages
Memory Areas
There are several memory areas into which the linker locates segments. For instance, the code objects from all modules in a program are combined into the CODE class while the xdata objects are combined into the XDATA class.
The linker provides directives (BIT, CODE, DATA, IDATA, PDATA, PRECEDE, STACK, and XDATA) you may use to specify the location and order of segments within a particular memory area.
The following default memory areas are generated automatically by the linker.
| Memory Area |
Address Range |
Description |
|---|---|---|
| BIT | I:20h.0-I:2Fh.7 | Bit memory limited to 16 Bytes. |
| CODE | C:0000h-C:0FFFFh | Code memory limited to 64 KBytes. |
| CONST | C:0000h-C:0FFFFh | Constant data limited to 64 KBytes. |
| DATA | D:00h-D:7Fh | Variable data limited to 128 Bytes and accessed using the MOV instructions. |
| IDATA | I:00h-I:0FFh | Variable data limited to 256 Bytes and accessed using the MOV @Rx instructions. |
| XDATA | X:0000h-X:0FFFFh | Variable data limited to 64 KBytes and accessed using the MOVX instruction. |
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