資料來源 : Free On-Line Dictionary of Computing
indirect address
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.
(1994-11-07)