51单片机存储器

51单片机存储空间一览：

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.

程序存储器

代码空间是只读空间; 它不能被写入修改. 代码存储可能存放于8051微处理器的内部或者外部，也有可能两者都有，这要根据8051具体设计架构以及其硬件设计来决定。

• 8051架构支持高达64K字节的程序存储器空间。然而，程序存储器可以通过使用代码块的方式扩展。
• 一些设备会提供更大的程序存储器空间
• 程序代码（包括所有函数和库例程）存储在程序存储器中。
• 常量存储在程序存储器中。
• 8051仅执行存储在程序存储器中的程序。
• 程序存储器可以使用代码存储器类型说明符C程序进行访问。

Internal Data Memory

Internal data memory resides within the 8051 MCU and is read/write. Up to 256 bytes of internal data memory are available depending upon the 8051 derivative. The first 128 bytes of internal data memory are both directly and indirectly addressable. The upper 128 b