Service manual

5. Memory control
1) Memory map
1 All range memory map
Fig. 5-1
(*1) “Internal I/O” means the registers in the H8/510.
(*2) “External I/O” means the base system I/O area to be ad-
dressed in page 0.
(*3) "Memory image area" means the lower 32KB of ROM area
which is projected to 000000H ~ 007FFFH for allowing reset
start and other vector addressing, or the lower 32KB of ROM
area which is projected to 008000H ~ 00FE7FH for allowing 0
page addressing of work RAM area.
(*4) “Expansion I/O” means expansion I/O device area which
isaddressed to area other than page 0.
2 0 page memory map
Fig. 5-2
• ROM image area: Image is formed in ROM area address C00000H
C07FFFH. This area is identical to IPL ROM area which will
beseparately developed.
• RAM image area: Image is formed in RAM area address
1D8000H1DFE7FH. (*Note)
* Note: Image can be formed in lower 32KB of RAS2.
3 ROM area memory map
Fig. 5-3
These two decode signals decode 512KB space respectively and
canbe used with max. 4MB ROM.
* Note: The lower 32KB of ROS1 signal is formed as OR of
image area in 0page.
Internal I/O
External I/O
Memory image area
(*1)
(*2)
(*3)
RAM area
(10M byte)
ROM area
(3M byte)
Expansion I/O area (1M byte)
000000H
100000H
800000H
C00000H
FFFFFFH
000000H
004000H
008000H
00FFFFH
1FFFFFH
ROM image area
32KB
RAM image area
slightly smaller than32KB
NOT USE
00F800H
00FE80H
00FF80H
00FFFFH
RAM image area
Internal I/O area
External I/O area
(0 page)
1BFFFFH
RAM area
C00000H
D00000H
EFFFFFH
NOT USE
ROS1
(256KB)
C80000H
ROS2
(256KB)
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