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##### 8.10.2.2 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`.