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CHAPTER 3 CPU
3.1 Memory Space
The logical address space of the FR20 series is 4 Gbytes (2
32
addresses), and the CPU
performs linear access.
■ Direct Addressing Area
The under-mentioned area of the address space is used for I/O. This area is called the "direct addressing
area" and operand addresses can be specified directly within the command. A direct area is different as
follows depending on the size of the accessed data.
• Byte data access:0-0FF
H
• Half word data access:0-1FF
H
• Word data access:0-3FF
H
■ Memory Map
Figure 3.1-1 shows the memory map of the MB91191/MB91192.