118
4.3
Overview of Bus Control
4.3.1
Area Division
The bus controller divides the 16-Mbyte address space into eight areas, 0 to 7, in 2-Mbyte units,
and performs bus control for external space in area units. Figure 4.5 shows an outline of the
memory map.
Chip select signals (
CS0
to
CS7
) can be output for each area.
Area 0
(2 Mbytes)
H'000000
H'FFFFFF
H'1FFFFF
H'200000
Area 1
(2 Mbytes)
H'3FFFFF
H'400000
Area 2
(2 Mbytes)
H'5FFFFF
H'600000
Area 3
(2 Mbytes)
H'7FFFFF
H'800000
Area 4
(2 Mbytes)
H'9FFFFF
H'A00000
Area 5
(2 Mbytes)
H'BFFFFF
H'C00000
Area 6
(2 Mbytes)
H'DFFFFF
H'E00000
Area 7
(2 Mbytes)
Advanced mode
Figure 4.5 Area Divisions
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