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 9.10.2.2 Register Names
 .......................
 
 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'.
 

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