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R0 refers to the first register in the register group, Register0. 51 MCU has 4 optional register sets. You need to read up on the basics....

51 MCU, assembly language, in the R0 register, is what register? What's the difference with registers A, B, etc.?

R0 refers to the first register in the register group, Register0. 51 MCU has 4 optional register sets. You need to read up on the basics.