 Cx51 User's Guide | |
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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions
Keywords Memory Areas Program Memory Internal Data Memory External Data Memory Far Memory SFR Memory Memory Models Small Model Compact Model Large Model Memory Types bdata code data far idata pdata 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 Generic Pointers Memory-Specific Pointers Pointer Conversions Abstract Pointers Function Declarations Parameters and the Stack Parameters and Registers Return Values Memory Models Register Banks Register Bank Access Interrupt Functions Reentrant Functions Alien (PL/M-51) Function Real-Time Function Tasks Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference AppendixSmall Model
In this model, all variables, by default, reside in the internal data memory of the 8051 system—as if they were declared explicitly using the data memory type specifier.
In this memory model, variable access is very efficient. However, all objects (that are not explicitly located in another memory area) and the stack must fit into the internal RAM. Stack size is critical because the stack space used depends on the nesting depth of the various functions.
Typically, if the linker is configured to overlay variables in the internal data memory, the small memory model is the best model to use.
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