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24
CHAPTER 1 OVERVIEW
1.7 Memory Address Space
The logical address space of the FR series consists of 4 gigabytes (2
32
addresses) and
the CPU accesses them linearly.
■
Memory map
Figure 1.7.1 shows the memory address space of the MB91F109.
Figure 1.7-1 MB91F109 Memory Map
Note:
The CPU can access no external areas in single-chip mode.
To enable the CPU to access an external area, select internal ROM external bus mode using
the mode register.
0000 0000
H
I/O I/O I/O
0000 0400
H
I/O I/O I/O
0000 0800
H
0000 1000
H
0000 1800
H
0001 0000
H
0001 0000
H
0008 0000
H
000C 0000
H
000C 0800
H
FLASH ROM
FLASH ROM
254KB
254KB
0010 0000
H
FFFF FFFF
H
FFFF FFFF
H
External-ROM
external-bus mode
Internal-ROM
external-bus mode
Single-chip mode
Direct
addressing
area
I/O map
(See Appendix A.)
Access inhibited
Access inhibited
Access inhibited
Access inhibited
Access inhibited
Access inhibited
Internal RAM 2 KB
Internal RAM 2 KB
Internal RAM 2 KB
Internal RAM 2 KB
Internal RAM 2 KB
Access inhibited
Access inhibited
Access inhibited
Access inhibited
External area
External area
External area