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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 PointersUnsigned 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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