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8051/8052 Microcontroller Tutorial

8051 Microcontroller Addressing Modes

Author : Craig Steiner
Source : 8052.com

Book : The 8051/8052 Microcontroller:
         Architecture, Assembly Language, And Hardware Interfacing (Paperback)

An "addressing mode" refers to how you are addressing a given memory location. In summary, the addressing modes are as follows, with an example of each:

Immediate Addressing MOV A,#20h
Direct Addressing MOV A,30h
Indirect Addressing MOV A,@R0
External Direct MOVX A,@DPTR
Code Indirect MOVC A,@A+DPTR

Each of these addressing modes provides important flexibility.

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