Addressing the Registers
Access to the digitizer’s registers is through addresses mapped into A24
address space. At power-on, the system resource manager (HP E1406) reads
the digitizer’s Device Type register (in A16 address space) to determine the
amount of A24 memory the digitizer needs (4096 bytes). The resource
manager allocates a block of A24 memory to the digitizer and writes the
base (starting) address into the digitizer’s Offset register (also in A16 space).
Figure C-1 is an example of how the HP E1406 resource manager maps the
digitizer registers into A16 and A24 address space.
Figure C-1. HP E1429A/B A24 Address Space
Appendix C Register Programming 343
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