Memory Address Space; Figure 1.7-1 Mb91F109 Memory Map - Fujitsu MB91F109 FR30 Hardware Manual

CHAPTER 1 OVERVIEW
1.7

Memory Address Space

The logical address space of the FR series consists of 4 gigabytes (2
the CPU accesses them linearly.
Memory map
Figure 1.7.1 shows the memory address space of the MB91F109.
External-ROM
external-bus mode
0000 0000
H
I/O
0000 0400
H
I/O
0000 0800
H
Access inhibited
0000 1000
H
Internal RAM 2 KB
0000 1800
H
Access inhibited
0001 0000
H
External area
FFFF FFFF
H
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.
24

Figure 1.7-1 MB91F109 Memory Map

Internal-ROM
external-bus mode
I/O
I/O
Access inhibited
Internal RAM 2 KB
Access inhibited
External area
Access inhibited
Internal RAM 2 KB
FLASH ROM
254KB
External area
32
addresses) and
Single-chip mode
I/O
I/O
Access inhibited
Internal RAM 2 KB
Access inhibited
0001 0000
Access inhibited
0008 0000
Access inhibited
000C 0000
Internal RAM 2 KB
000C 0800
FLASH ROM
254KB
0010 0000
Access inhibited
FFFF FFFF
Direct
addressing
area
I/O map
(See Appendix A.)
H
H
H
H
H
H