Using as: H8/300 Directives

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#### 9.12.4 H8/300 Machine Directives

`as` has the following machine-dependent directives for the H8/300:

`.h8300h`

  Recognize and emit additional instructions for the H8/300H variant, and also make `.int` emit 32-bit numbers rather than the usual (16-bit) for the H8/300 family.

`.h8300s`

  Recognize and emit additional instructions for the H8S variant, and also make `.int` emit 32-bit numbers rather than the usual (16-bit) for the H8/300 family.

`.h8300hn`

  Recognize and emit additional instructions for the H8/300H variant in normal mode, and also make `.int` emit 32-bit numbers rather than the usual (16-bit) for the H8/300 family.

`.h8300sn`

  Recognize and emit additional instructions for the H8S variant in normal mode, and also make `.int` emit 32-bit numbers rather than the usual (16-bit) for the H8/300 family.

On the H8/300 family (including the H8/300H) ‘`.word`’ directives generate 16-bit numbers.