as: H8/300-Regs
9.13.2.2 Register Names
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You can use predefined symbols of the form 'rNh' and 'rNl' to refer to
the H8/300 registers as sixteen 8-bit general-purpose registers. N is a
digit from '0' to '7'); for instance, both 'r0h' and 'r7l' are valid
register names.
You can also use the eight predefined symbols 'rN' to refer to the
H8/300 registers as 16-bit registers (you must use this form for
addressing).
On the H8/300H, you can also use the eight predefined symbols 'erN'
('er0' ... 'er7') to refer to the 32-bit general purpose registers.
The two control registers are called 'pc' (program counter; a 16-bit
register, except on the H8/300H where it is 24 bits) and 'ccr'
(condition code register; an 8-bit register). 'r7' is used as the stack
pointer, and can also be called 'sp'.
Info Catalog
as: H8/300-Chars
as: H8/300 Syntax
as: H8/300-Addressing