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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 
InstructionsArchitecture Overview
The 8051 Architecture Overview section describes:
- Memory Classes and Layout of the classic 8051, extended 8051 variants, and the NXP 80C51MX architecture
- CPU Registers of 8051 variants and the 251 architecture.
The picture below shows the object module flow and µVision components (in green) that can be used.
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