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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 MessagesMemory 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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