HD6433044 Datasheet, PDF (33/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

2.3 Address Space
The maximum address space of the H8/300H CPU is 16 Mbytes. The H8/3048 Series has various
operating modes (MCU modes), some providing a 1-Mbyte address space, the others supporting
the full 16 Mbytes.
Figure 2-2 shows the address ranges of the H8/3048 Series. For further details see section 3.6,
Memory Map in Each Operating Mode.
The 1-Mbyte operating modes use 20-bit addressing. The upper 4 bits of effective addresses are
ignored.
H'00000
H'000000
H'FFFFF
H'FFFFFF
a. 1-Mbyte modes
b. 16-Mbyte modes
Figure 2-2 Memory Map
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