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L166 User's Guide
Introduction Purpose of the Linker 
Combining Modules Combining Sections Aligning Sections Locating Sections Resolving Externals Calculating Addresses Generating an Object File Generating a Listing File Sections, Classes, and Groups Sections Classes Groups Real-Time Kernels 
Linking Programs Defining Physical Memory TGROUPS Error MessagesClasses
A class is an arbitrarily ordered collection of sections that share a common attribute. The purpose of a class is to allow manipulation of a number of sections using only the class name.
For instance, the near data objects from all modules in a program are combined into the NDATA class while the far constant objects are combined into the FCONST class. You may use the CLASSES linker directive to specify the address range for sections in a class rather than specifying the addresses for each section individually.
The following default classes are generated by the Keil C166 Compiler. However, any number of user classes may be created and linked.
| Class Name | Description |
|---|---|
| FCODE | Program memory limited to 16M. |
| FCONST | Constant data limited to 16M and usually stored in ROM. Individual objects are limited to 16K. |
| FDATA | Variable data limited to 16M and stored in RAM. Individual objects are limited to 16K. |
| FDATA0 | Variable data that is initialized to 0, limited to 16M, and stored in RAM. Individual objects are limited to 16K. |
| HCONST | Constant data limited to 16M and usually stored in ROM. Individual objects are limited to 64K. |
| HDATA | Variable data limited to 16M and stored in RAM. Individual objects are limited to 64K. |
| HDATA0 | Variable data that is initialized to 0, limited to 16M, and stored in RAM. Individual objects are limited to 64K. |
| ICODE | Program memory limited to 64K and stored in on-chip RAM. |
| IDATA | Variable data limited to 16K and stored in on-chip RAM. |
| IDATA0 | Variable data that is initialized to 0, limited to 16K, and stored in on-chip RAM. |
| NCODE | Program memory limited to 64K. |
| NCONST | Constant data limited to 16K and usually stored in ROM. |
| NDATA | Variable data limited to 16K and stored in RAM. |
| NDATA0 | Variable data that is initialized to 0, limited to 16K, and stored in RAM. |
| SDATA | Variable data limited to 16K and stored in on-chip XRAM. |
| SDATA0 | Variable data that is initialized to 0, limited to 16K, and stored in on-chip XRAM. |
| XCONST | Constant data limited to 16M and usually stored in ROM. Individual objects are limited to 16M. |
| XDATA | Variable data limited to 16M and stored in RAM. Individual objects are limited to 16M. |
| XDATA0 | Variable data that is initialized to 0, limited to 16M, and stored in RAM. Individual objects are limited to 16M. |
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