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C251 User's Guide
C251 Introduction Compiling Programs 
Language Extensions 
Keywords Memory Areas Program Memory Internal Data Memory External Data Memory Near Memory Far Memory Huge Memory SFR Memory Memory Models Tiny Model XTiny Model Small Model XSmall Model Large Model Memory Types Implicit Memory Types bdata code data ebdata far huge idata near xdata Data Types Special Function Registers sfr sfr16 sbit Bit-Addressable Objects bit Standard C Types void char int enum float double Type Modifiers signed unsigned short long Type Qualifiers const volatile Storage Classes auto register extern static Absolute Variable Location Pointers Memory Type in Pointer Declarations Pointer Conversions Function Declarations Memory Models Register Banks Interrupt Functions Reentrant Functions Alien (PL/M-51) Function Real-Time Function Tasks Preprocessor Advanced Programming Error Messages Library Reference AppendixMemory Models
The memory model determines the default memory type to use for function arguments, automatic variables, and declarations that include no explicit memory type. The C251 Compiler provides these memory models:
You may specify the memory model on the compiler command line using the TINY, SMALL, or LARGE directives or using #pragma in the source file. You may also specify the memory model on a function-by-function basis by adding the memory model to the function declaration.
Note
- Except in very special select applications, the SMALL memory model generates the fastest, most efficient code.
You may override the default memory type imposed by the memory model by explicitly declaring a variable with a memory type specifier.
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