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CHAPTER 2 CPU
2.6 Memory Map
This section shows an MB91F109 memory map and a memory map common to the FR
series.
■
MB91F109 Memory Map
The address space is 32 bits long linearly.
Figure 2.6.1 shows an MB91F109 memory map.
Figure 2.6-1 MB91F109 Memory Map
❍
Direct addressing area
The following area in the address space is used for I/O. The addresses in this area can be
directly specified for instruction operands.
The size of the direct addressing area varies depending on data length.
• Byte data (8 bits): 0 to 0FF
H
• Half-word data (16 bits): 0 to 1FF
H
• Word data (32 bits): 0 to 3FF
H
❍
Initial vector table area
The area ranging from 000FFC00
H
to 000FFFFF
H
is the EIT vector table initial area.
The vector table used for EIT processing can be mapped to desired addresses by rewriting the
TBR. The table is returned to these initial addresses when the TBR is reset.
0000 0000
H
0000 0100
H
0000 0200
H
0000 0400
H
000F FC00
H
000F FFFF
H
FFFF FFFF
H
Byte data
Half-word data
Word data
Initial vector
table area
Direct addressing area