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The basic architectural structure of this 8051 core is shown in Figure L. EXTERNAL. INTERRUPTS instructions call out these registers as RO through R7.The 8051 is the original member of the MCS®-51 family, and is the core for all MCS-51 devices. instructions call out these registers as RO through R 7. Instruction Set, and the Hardware Description of the. 80C51 in the Embedded Microcontrollers ~d pr~ sors Handbook (Order #270645). PIN DESCRIPTION. The 8051 Instruction Set Manual explains the standard 8051 instructions. The 8051 Instruction Set is supported by the Keil Ax51 Macro Assembler and the The 8051 instruction set is optimized for 8-bit control applications. It provides a variety of fast addressing modes for accessing the internal RAM to