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8051 Instruction Set Manual

Architecture Overview

8051 Instruction Set Manual

The 8051 Instruction Set Manual explains the standard 8051 instructions. The 8051 Instruction Set is supported by the Keil Ax51 Macro Assembler and the in-line Assembler of the Keil Cx51 Compiler.

This manual contains the following chapters:

Architecture Overview describes the memory layout and CPU registers of several 8051 variants.
Opcodes lists all opcodes ordered by opcode HEX value.
Instructions describes all of the 8051 instructions.

Revision History

January 2011: DA instruction adapted
April 2007: Added Graphics
September 2005: First draft

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