 C166 User's Guide | |
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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 Register Use Use in Macro Definitions Preprocessor Advanced Programming Error Messages Library Reference Appendixfar
The far memory type may be used for variables, constants, and functions. This memory is accessed using 32-bit addresses and may be on-chip or external.
- For variables, far memory is limited to 16M, objects are limited to 16K, and objects may not cross a 64K boundary. Variables declared far are located in the FDATA group.
- For constants (ROM variables), far memory is limited to 16M, objects are limited to 16K, and objects may not cross a 64K boundary. Constant variables declared far are located in the FCONST group.
- For program code (functions), far memory is limited to 16M. Program code declared far is stored in the FCODE group. Functions are invoked with the CALLS instruction.
Declare far objects as follows:
unsigned char far far_variable;
unsigned char const far far_const_variable;
unsigned int far far_func (void)
{
return (0);
}
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