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CHAPTER 23
µ
PD78F0354, 78F0354Y
User’s Manual U15798EJ2V0UD
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)
IXRAM3
IXRAM2
IXRAM1
IXRAM0
Internal expansion RAM capacity selection
1
0
1
1
512 bytes
Other than above
Setting prohibited
Address: FFF4H After reset: 0CH R/W
7
0
Symbol
IXS
6
0
5
0
4
0
3
IXRAM3
2
IXRAM2
1
IXRAM1
0
IXRAM0
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