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C251 User's Guide
C251 Introduction
Compiling Programs
Language Extensions
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Advanced Programming
Customization Files
Startup Code
Variable Initialization Code
Basic I/O
Memory Allocation
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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
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Absolute Memory Locations
Absolute Access Macros
Linker Location Controls
The _at_ Keyword
Debugging
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Library Reference
Appendix
C251 User's Guide
1-Byte Scalars
Scalars of type signed char and unsigned char are stored in a single byte (8 bits). Memory-specific pointers that reference data, idata, and pdata are stored using a single byte (8 bits).
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