HD64F3028F25 Datasheet, PDF (51/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

2.2 CPU Operating Modes
The H8/300H CPU has two operating modes: normal and advanced. Normal mode supports a
maximum 64-kbyte address space. Advanced mode supports up to 16 Mbytes.
Normal mode
Maximum 64 kbytes, program
and data areas combined
CPU operating modes
Advanced mode
Maximum 16 Mbytes, program
and data areas combined
Figure 2.1 CPU Operating Modes
2.3 Address Space
Figure 2.2 shows a simple memory map for the H8/3028 Group. The H8/300H CPU can address a
linear address space with a maximum size of 64 kbytes in normal mode, and 16 Mbytes in
advanced mode. 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'0000
H'FFFF
H'00000
H'FFFFF
H'000000
Normal mode
H'FFFFFF
a. 1-Mbyte mode
b. 16-Mbyte mode
Advanced mode
Figure 2.2 Memory Map
Rev. 2.00, 09/03, page 19 of 890