Types of Addressing Modes:
Each instruction of a computer mentions an operation on certain data. There are many ways of specifying address of the data to be operated on. These different types of ways to specifying data are called the addressing modes. The most frequent addressing modes are:
- Direct addressing mode
- Immediate addressing mode
- Register addressing mode
- Indirect addressing mode
- Displacement addressing mode
- Register indirect addressing mode
- Stack addressing mode
To mention the addressing mode of an instruction various methods are used. Most frequently used are following:
a) Different operands will use for different type of addressing modes.
b) One or more bits in the instruction format can be used as mode field. The value of the mode field is used to determine which addressing mode is to be used.
The effective address will be primary memory address of a register.