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C166 User's Guide
C166 Introduction Compiling Programs 
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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 AppendixXLarge Model
The xlarge memory model (selected with the XLARGE directive) uses the segmented mode of the C16x/ST10/XC16x microcontroller. In this memory model:
- Variables are stored in xhuge memory when they require more space than defined by the HOLD directive.
- Functions are stored in far memory and are accessed using far calls.
This memory model is the best choice for C16x/ST10/XC16x programs that have large code and data requirements.
Note
- The XLARGE memory model is not available for 80C166 microcontrollers.
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