Format Of Internal Memory Size Switching Register (Ims) - NEC mPD780208 Subseries User Manual

Figure 19-1. Format of Internal Memory Size Switching Register (IMS)
Symbol
7 6 5
IMS RAM2 RAM1 RAM0
Note The value of the internal memory size switching register after reset differs depending on the product (see
Table 19-2).
Table 19-2 lists the IMS setting values for a memory map equivalent to the mask ROM versions.
Table 19-2. Internal Memory Size Switching Register Setting Values
Target Product
µ PD780204
µ PD780204A
µ PD780205
µ PD780205A
µ PD780206
µ PD780208
µ PD78P0208
Caution
CHAPTER 19 µ PD78P0208
4 3 2 1
0 ROM3 ROM2 ROM1 ROM0
IMS Value After Reset
C8H
CFH
CAH
CFH
CCH
CFH
CFH
When using the µ PD780204, 780205, 780206, and 780208,
do not set any value other than the above IMS Value
After Reset to IMS.
When using the µ PD780204A and 780205A, be sure to
set the IMS Setting Value shown in Table 19-2 to IMS.
User's Manual U11302EJ4V0UM
0 Address After reset
Note
FFF0H
ROM3 ROM2 ROM1 ROM0
1 0 0
1 0 1
1 1 0
1 1 1
Other than above
Internal high-speed RAM capacity
RAM2 RAM1 RAM0
selection
1 1 0 1024 bytes
Other than above Setting prohibited
IMS Setting Value
C8H
CAH
R/W
R/W
Internal ROM capacity
selection
0 32 KB
0 40 KB
0 48 KB
1 60 KB
Setting prohibited
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