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8051 Instruction Set Manual
Architecture Overview Memory Classes and Layout 
Classic 8051 Classic 8051 Memory Layout Extended 8051 Variants Extended 8051 Memory Layout NXP 80C51MX NXP 80C51MX Memory Layout 251 Architecture 251 Memory Layout CPU Registers 8051 Variants 251 Architecture Program Status Word (PSW) Opcodes 
Instructions251 Memory Layout
The following figure shows the memory layout of the 251 architecture.
The 251 completely supports all aspects of the classic 8051 memory layout and instruction set. Existing 8051 programs can be directly execute on the 251. The four 8051 memory spaces (DATA, IDATA, CODE and XDATA) are mapped into specific regions of the 16 MB address space.
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