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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions Preprocessor 
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Startup Code Variable Initialization Code Basic I/O Memory Allocation Optimizer General Optimizations 251-Specific Optimizations Options for Code Generation Global Register Coloring Segment Naming Conventions Segment Types Initialization Segments Function Symbols Parameter Passing Symbols Hardware Stack Calculating Stack Size Interfacing C Programs to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments TINY Model XTINY Model SMALL Model XSMALL Model LARGE Model Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Floating-point Numbers Floating-point Errors Double Numbers Double Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging Error Messages Library Reference AppendixAbsolute Access Macros
Absolute memory access macros are provided as part of the C251 library. Use the following macros to directly access the memory areas of the 251.
Note
- The absolute memory access macros do not reserve memory at link/locate time. Therefore, it is possible to access any memory location in the 251 memory. The linker has no way to check if the memory location is reserved in a proper way. If you want to reserve memory for the variable access, you should use the _at_ keyword.
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