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Address Register Indirect

The address of a data operand is in an address register, called a pointer register.

• MOVE.L (A0),D3 - (A0) is an address, so the contents of the memory location with address (A0) is copied to D3.

• MOVE.W D3,(A0) - the low order word D3[15:0] is copied into the memory location with address (A0).

Address register indirect addressing is a very efficient and useful mode. The instruction accessing a data operand does not need to read from memory the address of the operand, since it is stored in an address register. It provides a method for generating addresses dynamically, and can be used to create data structures such as linked lists.

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