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C166 User's Guide
C166 Introduction Compiling Programs 
Language Extensions 
Keywords Memory Models Tiny Model Small Model Medium Model Compact Model Large Model HCompact Model HLarge Model XLarge Model Memory Types near far bdata ebdata idata sdata huge xhuge Memory Type Comparison Pointers with Memory Types Implicit Memory Types Type Qualifiers const volatile Data Types Special Function Registers sfr Types sbit Types bit Types Bit-Addressable Objects Function Declarations Return Values Register Bank Register Mask Interrupt Functions Fast Interrupts Cached Vectors Fast Register Banks Inline Functions Real-Time Function Tasks Inline Assembly Traditional Inline Assembly Extended Inline Assembly Operands Operators Register Use Use in Macro Definitions Preprocessor Advanced Programming Error Messages Library Reference Appendixnear
The near memory type may be used for variables, constants, and functions. This memory is accessed using 16-bit addresses and may be on-chip or external.
- For variables, near memory is limited to 16K, objects are limited to 16K, and objects may not cross a 64K boundary. Variables declared near are located in the NDATA group.
- For constants (ROM variables), near memory is limited to 16K, objects are limited to 16K, and objects may not cross a 64K boundary. Constant variables declared near are located in the NCONST group.
- For program code (functions), near memory is limited to 64K. Program code declared near is stored in the NCODE group. Functions are invoked with the CALLA or CALLR instruction.
Note
- The DPPUSE linker directive may be used to extend the amount of memory available to the NDATA and NCONST groups to a total of 64K.
Declare near objects as follows:
unsigned char near near_variable;
unsigned char const near near_const_variable;
unsigned int near near_func (void)
{
return (0);
}
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