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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
The near memory type may be used for variables and constants. This memory is accessed using 16-bit addresses and may be on-chip or external.
- For variables, near memory is limited to 64KB and may not cross a 64KB boundary. Variables declared near are located in the NDATA memory class.
- For constants (ROM variables), near memory is limited to 64KB and may not cross a 64KB boundary. Constant variables declared far are located in the NCONST group.
Declare near objects as follows:
unsigned char near near_variable; unsigned char const near near_const_variable;
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