 C166 User's Guide | |
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C166 User's Guide
C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Sections, Classes, and Groups
Special Sections Locating Sections Customization Files Startup Code STARTUP.A66 START167.A66 Basic I/O Memory Allocation TRAPS.C Optimizer Optimizer Options General Optimizations 80C166-Specific Optimizations Global Register Coloring DPP Registers Stacks System Stack User Stack Stack Sizes System Stack Size User Stack Size XBUS Memory and Peripherals On-chip XRAM XBUS Peripherals Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines TINY Model SMALL Model COMPACT Model MEDIUM Model LARGE Model Data Storage Formats Bit Variables 1-byte Scalars 2-byte Scalars 4-byte Scalars float Scalars float Errors double Scalars double Errors near Pointers far Pointers huge Pointers xhuge Pointers Absolute Memory Access Absolute Access Macros Linker Location Controls Debugging Error Messages Library Reference AppendixLocating Sections
There are two linker directives you may use to locate sections and classes to physical addresses.
- The CLASSES directive provides a way to assign all sections in a class to a specified address range.
- The SECTIONS directive provides a way to assign one or more sections to a specified address range.
Sections should be located to memory according to the following rules:
| Class Names | Location |
|---|---|
| NCODE | ROM or EPROM space for near code; must fit into one 64KByte segment. |
| NCONST | ROM or EPROM space for const near variables; must fit into one 16 KByte page. You may use the DPPUSE linker directive to enlarge address range for this class. |
| FCONST | ROM or EPROM space for const far variables. |
| HCONST | ROM or EPROM space for const huge variables. |
| XCONST | ROM or EPROM space for const xhuge variables. |
| FCODE | ROM or EPROM space for far code. |
| NDATA, NDATA0 | RAM space for near variables; both classes combined must fit into one 16 KByte page. You may use the DPPUSE linker directive to enlarge address range for these class. |
| SDATA, SDATA0 | RAM space for sdata variables; address range 0C000h-0FFFFh (Page 3). |
| IDATA, IDATA0 | On-chip RAM for idata variables:
|
| BIT, BIT0 | Bit-addressable RAM for bit variables; address range 0FD00h-0FDFFh. |
| BDATA, BDATA0 | Bit-addressable RAM for bdata variables; address range 0FD00h-0FDFFh. |
| FDATA, FDATA0 | RAM space for far variables. |
| HDATA, HDATA0 | RAM space for huge variables. |
| XDATA, XDATA0 | RAM space for xhuge variables. |
| ICODE | ROM or EPROM space; located in on-chip code memory. |
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