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CHAPTER 22
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PD78F0852
Preliminary User’s Manual U14581EJ3V0UM00
22.2 Internal Expansion RAM Size Switching Register (IXS)
The internal expansion RAM size switching register (IXS) is used to select the capacity of the internal expansion
RAM.
IXS is set with an 8-bit memory manipulation instruction.
RESET input sets IXS to 0CH.
Figure 22-2. Internal Expansion RAM Size Switching Register (IXS) Format
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
1
0
1
1
512 bytes
Other than above
Setting prohibited
Caution
The initial value of IXS is 0CH. Always set 0BH in this register.
Содержание mPD780851
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