Previous: H8/300-Regs, Up: H8/300 Syntax
as understands the following addressing modes for the H8/300:
r
n
Register direct
@r
n
Register indirect
@(
d
, r
n
)
@(
d
:16, r
n
)
@(
d
:24, r
n
)
Register indirect: 16-bit or 24-bit displacement d from register
n. (24-bit displacements are only meaningful on the H8/300H.)
@r
n
+
Register indirect with post-increment
@-r
n
Register indirect with pre-decrement
@
aa
@
aa
:8
@
aa
:16
@
aa
:24
Absolute address aa. (The address size :24 only makes
sense on the H8/300H.)
#
xx
#
xx
:8
#
xx
:16
#
xx
:32
Immediate data xx. You may specify the :8, :16, or
:32 for clarity, if you wish; but as neither
requires this nor uses it—the data size required is taken from
context.
@@
aa
@@
aa
:8
Memory indirect. You may specify the :8 for clarity, if you
wish; but as neither requires this nor uses it.
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