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Technical Support
On-Line Manuals
C166 User's Guide
C166 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 4.0 Differences
Version 3.0 Differences
Version 2.6 Differences
Version 2.0 Differences
Version 1.0 Differences
C. Writing Optimum Code
Memory Model
Variable Location
Variable Size
Automatic Variables
Avoid far/huge Pointer Cast
Optimum C16x Code
Other Sources
D. Compiler Limits
Compiler Limitations
OMF Limitations
E. Byte Ordering
F. Hints, Tips, and Techniques
Using Interrupts
Program Execution
Using the PEC
Stack Problems
Using Monitor-166
Using the bdata Type
Using TRAPS.C
C166 User's Guide
Variable Size
Members of the C16x/ST10 family are all 16-bit CPUs. Operations that use 16-bit types (like int and unsigned int) are much more efficient than operations that use char or long types. For this reason, use the int or unsigned int data types when possible and when RAM size is not critical.
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