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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 AppendixSmall Model
In the Small memory model, all variables, by default, reside in the internal data memory of the 251 system — as if they were declared explicitly using the data memory type specifier.
In this memory model, variable access is very efficient. Using the HOLD directive, you can direct variables above a specific object size to alternative memory areas. Data pointers are 4 byte pointers which allow the addressing of the entire 16 Mbyte address space.
The Small memory model is a good choice if you need variable access to the complete 16MB memory area.
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