Register Names
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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:
`cp'
code pointer
`dp'
data pointer
`bp'
base pointer
`tp'
stack top pointer
`ep'
extra pointer
`sr'
status register
`ccr'
condition code register
All registers are 16 bits long. To represent 32 bit numbers, use two
adjacent registers; for distant memory addresses, use one of the segment
pointers (`cp' for the program counter; `dp' for `r0'-`r3'; `ep' for
`r4' and `r5'; and `tp' for `r6' and `r7'.