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23.2 Internal Expansion RAM Size Switching Register
The internal expansion RAM size switching register (IXS) is used to set the internal expansion RAM capacity.
IXS is set by an 8-bit memory manipulation instruction.
RESET input sets the value of this register to 0CH.
Caution Be sure to set IXS to 0BH as the initial setting of the program. Reset input initializes IXS to 0CH.
Be sure to set IXS to 0BH after reset. Set the mask ROM versions in the same manner.
Figure 23-2. Format of Internal Expansion RAM Size Switching Register (IXS)
Address: FFF4H
After reset: 0CH
Symbol
7
IXS
0
IXRAM3
1
432
CHAPTER 23 µ PD78F0354, 78F0354Y
R/W
6
5
4
0
0
0
IXRAM2
IXRAM1
IXRAM0
0
1
1
Other than above
User's Manual U15798EJ2V0UD
3
2
1
IXRAM3
IXRAM2
IXRAM1
Internal expansion RAM capacity selection
512 bytes
Setting prohibited
0
IXRAM0
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