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Chapter 2 CPU Basics
Bank Function
2-6-3 Bank Memory Space
When bank function is used, the memory space, where CPU can access as data, shows as the following
hatched part.
Single Chip Mode
In single chip mode used internal ROM and internal RAM, an expanded bank area (bank 1, 2 and a part
of bank 3) is in the memory space of internal ROM. In the expanded bank area, reading out of table data
is enable, but rewrite is disable.
Figure 2-6-3 Single Chip Mode
Differs depending upon the model. [ Table 2-2-2. Internal ROM/ Internal RAM ]
00000
16 KB
00100
04000
10000
256 bytes
256 bytes
03F00
128 bytes
64 bytes
04080
040C0
48 KB
00C00
64 KB
20000
3FFFF
Read / Write
(3
KB
)
(4
8 KB
)
Read
30000
64 KB
64
KB
Instruction code
table data
Peripheral I/O
Interrupt
vector table
Subroutine
vector table
Data
abs8 addressing
access area
Internal RAM
I/O space
(Special Function Register)
Internal ROM
bank 1
bank 2
bank 3
bank 0