UPD78F0138 NEC, UPD78F0138 Datasheet - Page 49

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

3.1 Memory Space
Products in the 78K0/KE1 can each access a 64 KB memory space. Figures 3-1 to 3-8 show the memory maps.
Caution Regardless of the internal memory capacity, the initial values of the internal memory size
switching register (IMS) and internal expansion RAM size switching register (IXS) of all products
in the 78K0/KE1 are fixed (IMS = CFH, IXS = 0CH). Therefore, set the value corresponding to
each product as indicated below.
Note The
µ
µ
µ
µ
µ
µ
µ
µ
PD780131
PD780132
PD780133
PD780134
PD78F0134
PD780136
PD780138
PD78F0138
Table 3-1. Set Values of Internal Memory Size Switching Register (IMS)
µ
PD78F0134 does not support the
Note
and Internal Expansion RAM Size Switching Register (IXS)
CHAPTER 3 CPU ARCHITECTURE
42H
44H
C6H
C8H
Value corresponding to mask ROM version
CCH
CFH
Value corresponding to mask ROM version
User’s Manual U16228EJ2V0UD
IMS
µ
PD780136 and 780138.
0CH
0AH
IXS
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