Addressing Modes
................

   as understands the following addressing modes for the H8/300:
`rN'
     Register direct

`@rN'
     Register indirect

`@(D, rN)'
`@(D:16, rN)'
     Register indirect: 16-bit displacement D from register N.  (You
     may specify the `:16' for clarity if you wish, but it is not
     required and has no effect.)

`@rN+'
     Register indirect with post-increment

`@-rN'
     Register indirect with pre-decrement

``@'AA'
``@'AA:8'
``@'AA:16'
     Absolute address `aa'.  You may specify the `:8' or `:16' for
     clarity, if you wish; but `as' neither requires this nor uses
     it--the address size required is taken from context.

`#XX'
`#XX:8'
`#XX:16'
     Immediate data XX.  You may specify the `:8' or `:16' 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.