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118
•
ADRCR is allocated to address H'FEE01E. In the H8/3062F-ZTAT, the corresponding
address is empty space, but it is necessary to confirm that no accesses are made to H'FEE01E
in the program.
•
When address update mode 2 is selected, the address in an internal space (on-chip memory or
internal I/O) access cycle is not output externally.
•
In order to secure address holding with respect to the rise of
RD
, when address update mode 2
is used an external space read access must be completed within a single access cycle. For
example, in a word access to 8-bit access space, the bus cycle is split into two as shown in
figure 6.6, and so there is not a single access cycle. In this case, address holding is not
guaranteed at the rise of
RD
between the first (even address) and second (odd address) access
cycles (area inside the ellipse in the figure).
On-chip
memory cycle
On-chip
memory cycle
External read cycle
(8-bit space word access)
Address update
mode 2
RD
Even address
Odd address
Figure 6.6 Example of Consecutive External Space Accesses in Address Update Mode 2
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