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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 AppendixNear Memory
The near memory area is in the address range 00:0000 to 00:FFFF, which is the first 64 Kbytes of the 251 memory. Part of the near memory resides within the 251 MCU and may be accessed very quickly using 16 bit addressing. The near memory area is represented at the assembly language level by the memory classes EDATA or ECONST. Variables stored in near memory are accessed using direct addressing.
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