##### 8.8.2.3 Addressing Modes

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.