You can use the predefined symbols `r0', `r1', `r2', `r3', `r4', `r5', `r6', and `r7' to refer to the H8/500 registers.
The H8/500 also has these control registers:
All registers are 16 bits long. To represent 32 bit numbers, use two
adjacent registers; for distant memory addresses, use one of the segment
cp for the program counter;
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