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2.3 Address Space
The maximum address space of the H8/300H CPU is 16 Mbytes. This LSI allows selection of a
normal mode and advanced mode 1-Mbyte mode or 16-Mbyte mode for the address space
depending on the MCU operation mode. Figure 2-2 shows the address ranges of the H8/3039
Series. For further details see section 3.6, Memory Map in Each Operating Mode.
The 1-Mbyte operating mode uses 20-bit addressing. The upper 4 bits of effective addresses are
ignored.
H'00000
H'00000
H'000000
H'FFFFF
H'FFFFF
H'FFFFFF
(a) 1-Mbyte mode
(b) 16-Mbyte mode
1. Normal mode (64-Kbyte mode)
2. Advanced mode
Figure 2-2 Memory Map
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