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Cx51 User's Guide
Cx51 Introduction Compiling Programs 
Language Extensions 
Keywords Memory Areas Program Memory Internal Data Memory External Data Memory Far Memory SFR Memory Memory Models Small Model Compact Model Large Model Memory Types bdata code data far idata pdata 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 Generic Pointers Memory-Specific Pointers Pointer Conversions Abstract Pointers Function Declarations Parameters and the Stack Parameters and Registers Return Values Memory Models Register Banks Register Bank Access Interrupt Functions Reentrant Functions Alien (PL/M-51) Function Real-Time Function Tasks Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference AppendixProgram Memory
Program (CODE) memory is read only; it cannot be written to. Program memory may reside within the 8051 MCU, it may be external, or it may be both, depending upon the 8051 derivative and the hardware design.
- The 8051 architecture supports up to 64K Bytes of program memory. However, program space can be expanded using code banking.
- Some devices offer a larger code space.
- Program code, including all functions and library routines, is stored in program memory.
- Constant variables may also be stored in program memory.
- The 8051 executes programs stored in program memory only.
- Program memory may be accessed from your C programs using the code memory type specifier.
Note
- Program memory may be accessed indirectly using the MOVC instruction. It may not be accessed directly.
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