Preliminary User’s Manual U17260EJ3V1UD
47
CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
Products in the 78K0/KE2 can access a 64 KB memory space. Figures 3-1 to 3-8 show the memory maps.
Cautions 1. Regardless of the internal memory capacity, the initial values of the internal memory size
switching register (IMS) and internal expansion RAM size switching register (IXS) of all
products in the 78K0/KE2 are fixed (IMS = CFH, IXS = 0CH). Therefore, set the value
corresponding to each product as indicated below.
2. To set the memory size, set IMS and then IXS. Set the memory size so that the internal ROM
and internal expansion RAM areas do not overlap.
Table 3-1. Set Values of Internal Memory Size Switching Register (IMS)
and Internal Expansion RAM Size Switching Register (IXS)
Flash Memory Version
(78K0/KE2)
IMS IXS ROM
Capacity
Internal High-Speed
RAM Capacity
Internal Expansion
RAM Capacity
µ
PD78F0531
04H
16 KB
768 bytes
µ
PD78F0532 C6H
24
KB
µ
PD78F0533 C8H
0CH
32 KB
−
µ
PD78F0534
CCH
0AH
48 KB
1 KB
µ
PD78F0535
CFH
0BH
60 KB
2 KB
µ
PD78F0536 CCH
Note
04H
96
KB
Note
4
KB
µ
PD78F0537, 78F0537D
CCH
Note
00H
128
KB
Note
1 KB
6 KB
Note
The
µ
PD78F0536, 78F0537, and 78F0537D have internal ROMs of 96 KB and 128 KB, respectively.
However, the set value of IMS of these devices is the same as those of the 48 KB product because memory
banks are used. For how to set the memory banks, see
4.2 Memory Bank Select Register (BANK)
.
Содержание 78K/0 Series
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