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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 
InstructionsCPU Registers
CPU Registers provide explanations to the following register types:
In addition to the CPU registers R0 - R7, all x51 variants have an SFR space that is used to address on-chip peripherals and I/O ports. The SFR area includes the CPU registers SP (stack pointer), PSW (program status word), A (accumulator, accessed via the SFR space as ACC), B, DPL and DPH (16-bit register DPTR).
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