Node:H8/300-Regs, Next:H8/300-Addressing, Previous:H8/300-Chars, Up:H8/300 Syntax

##### Register Names

You can use predefined symbols of the form `r` n `h` and `r` n `l` 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 `r` n`` 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 `er` n`` (`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`.