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Computing (FOLDOC) dictionary
indirect address
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processor An addressing mode found in many processors'
instruction sets where the instruction contains the address
of a memory location which contains the address of the operand
(the "effective address") or specifies a register which
contains the effective address. In the first case
(indirection via memory), accessing the operand requires two
memory accesses - one to fetch the effective address and
another to read or write the actual operand. Register
indirect addressing requires only one memory access.
An indirect address may be indicated in assembly language by
an operand in parentheses, e.g. in Motorola 68000 assembly
MOV D0,(A0)
writes the contents of register D0 to the location pointed to
by the address in register A0.
Indirect addressing is often combined with pre- or post-
increment or decrement addressing, allowing the address of the
operand to be increased or decreased by one (or some specified
number) either before or after using it.