8.8.2.2 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
.