as implements all the standard H8/300 opcodes. No additional
pseudo-instructions are needed on this family.
Four H8/300 instructions (
sub) are defined with variants using the suffixes ‘.b’,
‘.w’, and ‘.l’ to specify the size of a memory operand.
as supports these suffixes, but does not require them;
since one of the operands is always a register,
deduce the correct size.
For example, since
r0 refers to a 16-bit register,
is equivalent to
If you use the size suffixes,
as issues a warning when
the suffix and the register size do not match.