##### 8.27.2.3 Addressing Modes

`as` understands the following addressing modes for the SH. `R` n in the following refers to any of the numbered registers, but not the control registers.

`R` n
  Register direct
`@R` n
  Register indirect
`@-R` n
  Register indirect with pre-decrement
`@R` n `+`
  Register indirect with post-increment
`@(` disp `, R` n `)`
  Register indirect with displacement
`@(R0, R` n `)`
  Register indexed
`@(` disp `, GBR)`
  `GBR` offset
`@(R0, GBR)`
  GBR indexed
addr
`@(` disp `, PC)`
  PC relative address (for branch or for addressing memory). The `as` implementation allows you to use the simpler form addr anywhere a PC relative address is called for; the alternate form is supported for compatibility with other assemblers.
`#` imm
  Immediate data