Preliminary User’s Manual U19014EJ1V0UD
30
CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
The
µ
PD78F0730 can access a 64 KB memory space. Figure 3-1 shows the memory map.
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) are fixed
(IMS = CFH, IXS = 0CH). Therefore, set the value 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
(
µ
PD78F0730)
IMS IXS ROM
Capacity
Internal High-Speed
RAM Capacity
Internal Expansion
RAM Capacity
µ
PD78F0730
C4H
08H
16 KB
1 KB
2 KB
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