18
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 H8/3022
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'000000
H'FFFFFF
(b) 16-Mbyte mode
(a) 1-Mbyte mode
2. Advanced mode
1. Normal mode
(64-Kbyte mode)
*
Note:
*
Normal mode cannot be used with this LSI.
H'00000
H'FFFFF
H'00000
H'FFFFF
Figure 2-2 Memory Map