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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
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
Scalars: 1-Byte
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). If an enum can be represented with an 8-bit value, the enum is also stored in a single byte.
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