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CHAPTER 3 CPU AND CONTROL UNITS
3.1
Memory Space
The MB91319 has a logical address space of 4 GB (2
accesses linearly.
■ Memory Space
The MB91319 has a logical address space of 4GB (2
lineally.
❍ Direct addressing area
The areas in the address space listed below are used for input-output.
These areas called the direct addressing area. The address of an operand can be directly
specified in an instruction.
The size of the direct addressing area varies according to the size of data to be accessed:
•
Byte data access
•
Half word data access : 000
•
Word data access
■ Memory Map
Figure 3.1-1 shows the memory space of this product.
*1: Internal RAM area of MB91F318A/S and MB91FV319R becomes 0003 4000
Internal RAM area of MB91316 becomes 0003 8000
*2: For the MB91316, MASK ROM 512KB is used (0008 0000
*3: For the MB91F318A/S, MB91316, MASK ROM 384KB is used (0008 0000
30
: 000
to 0FF
H
to 1FF
H
: 000
to 3FF
H
Figure 3.1-1 Memory Map
Single-chip mode
0000 0000
Direct addressing area
I/O
0000 0400
Refer to I/O map
I/O
0001 0000
Access disabled
0002 F800
Font RAM
0003 0000
1
Internal RAM *
0004 0000
Access disabled
0005 0000
Access disabled
0006 0000
USB-FUNC
0007 0000
OSDC
0008 0000
FlashROM1
Program
2
1MB *
0018 0000
FlashROM2
Font
3
512KB *
0020 0000
Access disabled
FFFF FFFF
32
addresses), which the CPU
32
addresses), while the CPU access
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
to 0003 FFFF
.
H
H
to 000F FFFF
).
H
H
H
to 0003 FFFF
.
H
H
to 0019 7FFF
).
H
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