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26.2 Internal Expansion RAM Size Switching Register
The internal expansion RAM capacity can be selected using the internal expansion RAM size switching register
(IXS).
This register is set by an 8-bit memory manipulation instruction.
RESET input sets IXS to 0CH.
Caution The initial value of IXS is 0CH. Be sure to set each product to the values shown in Table 26-3 at
initialization. Also, when using the 78K0/KE1+ to evaluate the program of a mask ROM version
of the 78K0/KE1, be sure to set the values shown in Table 26-3.
Figure 26-2. Format of Internal Expansion RAM Size Switching Register (IXS)
Address: FFF4H
After reset: 0CH
Symbol
7
IXS
0
IXRAM4
0
0
The IXS settings required to obtain the same memory map as mask ROM versions of the 78K0/KE1 are shown in
Table 26-3.
Table 26-3. Internal Expansion RAM Size Switching Register Settings
Flash Memory Versions
µ
PD78F0132H
µ
PD78F0133H
µ
PD78F0134H
µ
PD78F0136H
µ
PD78F0138H, 78F0138HD
CHAPTER 26 FLASH MEMORY
R/W
6
5
0
0
IXRAM4
IXRAM3
IXRAM2
IXRAM1
1
1
1
0
Other than above
Target Mask ROM Versions
(78K0/KE1+)
µ
−
PD780131
µ
PD780132
µ
PD780133
µ
PD780134
µ
PD780136
µ
PD780138
User's Manual U16899EJ2V0UD
4
3
2
IXRAM3
IXRAM2
IXRAM0
Internal expansion RAM capacity selection
0
0
0 bytes
1
0
1024 bytes
Setting prohibited
IXS Setting
(78K0/KE1)
1
0
IXRAM1
IXRAM0
0CH
0CH
0CH
0CH
0AH
0AH
431
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