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Created page with 'Category:Computer Architecture ''Addressing modes'' specify how the data/arguments for an instruction are retrieved/stored. Addressing modes may include: * Implicit - A…'
[[Category:Computer Architecture]]
''Addressing modes'' specify how the data/arguments for an [[instruction]] are retrieved/stored.
Addressing modes may include:
* Implicit - Any arguments are implied by the instruction (e.g., a return-from-subroutine instruction, which pop a value off the [[Stack|stack]] and place it in the [[Register#Program Counter|program counter]]).
* Register - Data is read from (or written to) a register.
* Absolute - An exact memory address is specified.
* Indirect - A memory address is specified, which contains the address of the memory for reading/writing. Effectively, the argument in this addressing mode is the address of a pointer to the actual data.
* Base plus offset - An absolute or indirect memory address is specified as a base address along with a register that contains an offset value. The base and offset values are added together, and the resulting address is used to read/write data.
* Relative - A [[Signed|signed or unsigned]] offset is added to the current [[Register#Program Counter|program counter]] to obtain a new address. This is most often used for jumps but is also used for some kinds of data access.
* Stack - Values are pushed to or popped from the [[Stack|stack]].
''Addressing modes'' specify how the data/arguments for an [[instruction]] are retrieved/stored.
Addressing modes may include:
* Implicit - Any arguments are implied by the instruction (e.g., a return-from-subroutine instruction, which pop a value off the [[Stack|stack]] and place it in the [[Register#Program Counter|program counter]]).
* Register - Data is read from (or written to) a register.
* Absolute - An exact memory address is specified.
* Indirect - A memory address is specified, which contains the address of the memory for reading/writing. Effectively, the argument in this addressing mode is the address of a pointer to the actual data.
* Base plus offset - An absolute or indirect memory address is specified as a base address along with a register that contains an offset value. The base and offset values are added together, and the resulting address is used to read/write data.
* Relative - A [[Signed|signed or unsigned]] offset is added to the current [[Register#Program Counter|program counter]] to obtain a new address. This is most often used for jumps but is also used for some kinds of data access.
* Stack - Values are pushed to or popped from the [[Stack|stack]].
