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CHAPTER 21
µ
PD78F0066
Preliminary User’s Manual U13420EJ2V0UM00
21.2 Internal Expansion RAM Size Switching Register
The internal expansion RAM size switching register (IXS) is a register used to set internal expansion RAM capacity.
IXS is set by using 8-bit memory manipulation instruction.
RESET input sets IXS to 0CH.
Caution
Set IXS to 04H as the initial value of the program. The initial value of IXS is 0CH (setting
prohibited).
Figure 21-2. Format of Internal Expansion RAM Size Switching Register (IXS)
Address: FFF4H After reset: 0CH R/W
Symbol
7
6
5
4
3
2
1
0
IXS
0
0
0
IXRAM4
IXRAM3
IXRAM2
IXRAM1
IXRAM0
IXRAM4
IXRAM3
IXRAM2
IXRAM1
IXRAM0
Internal expansion RAM capacity selection
0
0
1
0
0
4096 bytes
Other than above
Setting prohibited
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