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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 Monitor
C251 User's Guide
A. ANSI C Implementation
The C251 Compiler is based on ISO/IEC 9899:1990 standard (which is also known as ANSI C Standard C90). This appendix describes the Implementation-defined Behavior and lists differences to the ANSI C Standard.
The C251 Compiler differs in only a few aspects from the ANSI C Standard. These differences can be grouped into compiler-related differences and library-related differences.
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