 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 AppendixSpecial Sections
There are several special features of some sections:
- Sections that contain a 0 in the section name prefix or class name are cleared to zero by the startup code.
- The ?C_MEMCLRSEC section is generated by the L166 Linker. It contains the address ranges of the memory that is cleared to zero.
- The ?C_INITSEC section contains initialization data for global and static objects that are initialized to a value other than zero.
- The ?C_STARTUP_CODE section contains the startup code that initializes the MCU. This code is executed before the main C function is called. If you use on-chip ROM, the startup code must be located there and must be assigned the ICODE class.
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