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Mapping of Register Block
The default address of the register block is 0x0000.
The register block can be reassigned to any 2-Kbyte boundary within the 64-Kbyte address space.
The register block occupies the first 512 bytes of the assigned 2-Kbyte block.
Bits 7 through 3 of INITRG (0x0011) specify the most-significant five bits of the registers in the 16-bit register block.
INITRG can be read any time but written only once in normal modes (any time in special modes).
Resource mapping is covered in section 5.3 of the M68HC12B Family Data Sheet.