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Technical Support
On-Line Manuals
Cx51 User's Guide
Cx51 Introduction
Compiling Programs
Language Extensions
Preprocessor
Advanced Programming
8051 Derivatives
Error Messages
Library Reference
Appendix
A. ANSI C Implementation
Implementation-defined Behavior
Compiler-Related
Library-Related
B. Version Differences
Version 6.0 Differences
Version 5.0 Differences
Version 4.0 Differences
Version 3.4 Differences
Version 3.2 Differences
Version 3.0 Differences
Version 2.0 Differences
C. Writing Optimum Code
Memory Model
Variable Location
Variable Size
Unsigned Types
Local Variables
Other Sources
D. Compiler Limits
E. Byte Ordering
F. Hints, Tips, and Techniques
Recursive Code References
Problems Using printf
Uncalled Functions
Using Monitor-51
Trouble with bdata
Function Pointers
Unsigned Types
The 8051 family of processors does not specifically support operations with signed numbers. The compiler must generate additional code to deal with sign extensions. Far less code is produced if unsigned objects are used wherever possible.
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