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UPD780138 Datasheet(PDF) 49 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 49 Page - NEC

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User’s Manual U16228EJ2V0UD
49
CHAPTER 3 CPU ARCHITECTURE
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.
Table 3-1. Set Values of Internal Memory Size Switching Register (IMS)
and Internal Expansion RAM Size Switching Register (IXS)
IMS
IXS
µPD780131
42H
µPD780132
44H
µPD780133
C6H
µPD780134
C8H
0CH
µPD78F0134Note
Value corresponding to mask ROM version
µPD780136
CCH
µPD780138
CFH
0AH
µPD78F0138
Value corresponding to mask ROM version
Note The
µPD78F0134 does not support the µPD780136 and 780138.


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