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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference 
Appendix A. ANSI C Implementation 
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 1.0 Differences C51 Version 5 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Local Variables Use 251 Source Mode Other Sources D. Compiler Limits E. Byte Ordering F. Hints, Tips, and Techniques Tips for Program Execution Tips for the Stack Tips for Interrupts Function Pointers Problems Using printf Uncalled Functions Trouble with bdata Tips for Porting C51 Code Tips for the Intel RISM MonitorVariable Size
Members of the 251 family are all 8 bit MCUs. Operations that use 8 bit types (like char and unsigned char) are much more efficient than operations that use int or long types. For this reason, always use the smallest data type possible.
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