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Technical Support
On-Line Manuals
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
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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
Appendix
Program 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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