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8.8.2.3 Addressing Modes

as understands the following addressing modes for the H8/300:

rn
Register direct
@rn
Register indirect
@(d, rn)
@(d:16, rn)
@(d:24, rn)
Register indirect: 16-bit or 24-bit displacement d from register n. (24-bit displacements are only meaningful on the H8/300H.)
@rn+
Register indirect with post-increment
@-rn
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.