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CPU 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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