9.12.2.3 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.