CHAPTER 19 FLASH MEMORY
Preliminary User’s Manual U19014EJ1V0UD
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19.2 Internal Expansion RAM Size Switching Register
The internal expansion RAM capacity can be selected using the internal expansion RAM size switching register
(IXS).
IXS is set by an 8-bit memory manipulation instruction.
Reset signal generation sets IXS to 0CH.
Caution Be sure to set to 08H after a reset release.
Figure 19-2. 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 1 0 0 0
2048
bytes
Other than above
Setting prohibited
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