Chapter 27.
M68HC11 and M68HC12 Dependent Features
27.1. M68HC11 and M68HC12 Options
The Motorola 68HC11 and 68HC12 version of
as
have a few machine dependent options.
 m68hc11
This option switches the assembler in the M68HC11 mode. In this mode, the assembler only
accepts 68HC11 operands and mnemonics. It produces code for the 68HC11.
 m68hc12
This option switches the assembler in the M68HC12 mode. In this mode, the assembler also
accepts 68HC12 operands and mnemonics. It produces code for the 68HC12. A few 68HC11
instructions are replaced by some 68HC12 instructions as recommended by Motorola specifica 
tions.
 m68hcs12
This option switches the assembler in the M68HCS12 mode. This mode is similar to
 m68hc12
but specifies to assemble for the 68HCS12 series. The only difference is on the assembling of the
movb
and
movw
instruction when a PC relative operand is used.
 mshort
This option controls the ABI and indicates to use a 16 bit integer ABI. It has no effect on the
assembled instructions. This is the default.
 mlong
This option controls the ABI and indicates to use a 32 bit integer ABI.
 mshort double
This option controls the ABI and indicates to use a 32 bit float ABI. This is the default.
 mlong double
This option controls the ABI and indicates to use a 64 bit float ABI.
 strict direct mode
You can use the
 strict direct mode
option to disable the automatic translation of direct
page mode addressing into extended mode when the instruction does not support direct mode.
For example, the
clr
instruction does not support direct page mode addressing. When it is used
with the direct page mode,
as
will ignore it and generate an absolute addressing. This option
prevents
as
from doing this, and the wrong usage of the direct page mode will raise an error.






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