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Cx51 User's Guide
Cx51 Introduction
Compiling Programs
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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
Scalars: 1-Byte
Scalars: 2-Byte
Scalars: 4-Byte
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
Data Objects
Data objects are the variables and constants you declare in your C programs. The Cx51 Compiler generates a separate segment for each memory type for which a variable is declared. The following table lists the segment names generated for different variable data objects.
| Segment Name | Description |
|---|---|
| ?BA?module_name | Bit-addressable data objects |
| ?BI?module_name | Bit objects |
| ?CO?module_name | Constants (strings and initialized variables) |
| ?DT?module_name | Objects declared in data |
| ?FC?module_name | Objects declared in const far (requires OMF2 directive) |
| ?FD?module_name | Objects declared in far (requires OMF2 directive) |
| ?ID?module_name | Objects declared in idata |
| ?PD?module_name | Objects declared in pdata |
| ?XC?module_name | Objects declared in const xdata (requires OMF2 directive) |
| ?XD?module_name | Objects declared in xdata |
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