upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 435

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

26.2 Internal Expansion RAM Size Switching Register
(IXS).
Table 26-3.
The internal expansion RAM capacity can be selected using the internal expansion RAM size switching register
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
The IXS settings required to obtain the same memory map as mask ROM versions of the 78K0/KE1 are shown in
Address: FFF4H
Symbol
IXS
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)
IXRAM4
Table 26-3. Internal Expansion RAM Size Switching Register Settings
PD78F0132H
PD78F0133H
PD78F0134H
PD78F0136H
PD78F0138H, 78F0138HD
7
0
0
0
After reset: 0CH
Flash Memory Versions
(78K0/KE1+)
IXRAM3
6
0
1
1
Other than above
R/W
CHAPTER 26 FLASH MEMORY
IXRAM2
User’s Manual U16899EJ3V0UD
5
0
1
0
PD780131
PD780132
PD780133
PD780134
PD780136
PD780138
Target Mask ROM Versions
IXRAM4
IXRAM1
4
0
1
(78K0/KE1)
IXRAM0
IXRAM3
3
0
0
Internal expansion RAM capacity selection
0 bytes
1024 bytes
Setting prohibited
IXRAM2
2
IXS Setting
0CH
0CH
0CH
0CH
0AH
0AH
IXRAM1
1
IXRAM0
0
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