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Technical Support
On-Line Manuals
Cx51 User's Guide
Cx51 Introduction
Compiling Programs
Language Extensions
Preprocessor
Advanced Programming
Customization Files
Startup Code
Variable Initialization Code
XBANKING.A51
Basic I/O
Memory Allocation
Optimizer
Optimizer Options
General Optimizations
8051-Specific Optimizations
Global Register Coloring
Segment Naming Conventions
Data Objects
Program Objects
Parameters and Local Variables
Interfacing C to Assembler
Global Variables
Function Parameters
Passing in Memory
Passing in Registers
Function Return Values
Using the SRC Directive
Register Usage
Overlaying Segments
Small Model Example
Compact Model Example
Large Model Example
Interfacing C programs to PL/M-51
Data Storage Formats
Bit Variables
1-Byte Scalars
2-Byte Scalars
4-Byte Scalars
Generic and Far Pointers
Floating-point Numbers
Floating-point Errors
Absolute Memory Locations
Absolute Access Macros
Linker Location Controls
The _at_ Keyword
Debugging
8051 Derivatives
Error Messages
Library Reference
Appendix
Cx51 User's Guide
Register Usage
Assembler functions may change all register contents in the currently selected register bank as well as the contents of the ACC, B, DPTR, and PSW registers. When invoking a C function from assembly, assume that these registers are destroyed by the C function that is called.
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