addressing modes

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the way using which the data sources or destinations addresses are specified in the instruction mnemonics for moving data, is called addressing mode.

immediate, register, direct, indirect, implied, indexed.

immediate addressing mode

in this addressing mode the source operand is a constant rather than a variable. so the constant can be incorporated in the instruction. sign # indicates it is a immediate addressing mode.

register addressing mode.

the 8051 can access 8 working registers code within the instructions selects one of the eight registers from the selected register bank. in the register addressing mode, the data to be operated in within the register