Explain direct, indirect and register addressing modes with examples.

Register addressing mode: It means that the register is the source of an operand for an instruction

Example: MOV CX, AX ;copies the contents of the 16-bit AX register into  ;the 16-bit CX register),

ADD BX, AX

Direct addressing mode: The addressing mode in which the effective address of the memory location is written directly in the instruction.

Example: MOV AX [1592 H] MOV AL [0300 H]

Register indirect addressing mode: This addressing mode allows data to be addressed at any memory location through an offset address held in any of the following registers: BP, BX, DI & SI.

Example: MOV AX, [BX] ;Suppose the register BX contains 4895 H, then the contents ;4895H are moved to AX

ADD CX, {BX}