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CHAPTER 3 CPU AND CONTROL UNITS
3.1
Memory Space
The MB91260B series has 4 Gbytes of logical address space (2
be linearly accessed by the CPU.
■ Direct Addressing Area
Each of the following areas in the address space is used for input/output.
This area is referred to as the direct addressing area which allows an instruction to directly specify the
address of a location in that area as the instruction's operand.
The direct addressing area varies as shown below depending on the size of data accessed:
• Byte data access
• Halfword data access
• Word data access
■ Memory Map
26
: 000
: 000
: 000
Figure 3.1-1 Memory Map
0000 0000
H
0000 0100
H
0000 0200
H
0000 0400
H
000F FC00
H
Vector table
initialization area
000F FFFF
H
FFFF FFFF
H
to 0FF
H
H
to 1FF
H
H
to 3FF
H
H
Byte data
Direct
Halfword data
addressing area
Word data
32
addresses) which can
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