參數(shù)資料
型號(hào)： UPD178023GF
廠商： NEC Corp.
元件分類(lèi)： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁(yè)數(shù)： 18/56頁(yè)
文件大小： 261K
代理商： UPD178023GF
18
μ
PD178023, 178024
Data Sheet U14126EJ1V0DS00
2.2 Internal Extension RAM Size Select Register (IXS)
The internal extension RAM size select register (IXS) sets the internal extension RAM capacity.
Use the
μ
PD178023,
μ
PD178024 with the initial value (0CH).
Use an 8-bit memory manipulation instruction to set the IXS.
This register is set to 0CH at reset.
Caution Do not assign a value other than that the value at reset.
Figure 2-3. Format of Internal Extension RAM Size Select Register (IXS)
IXRAM4 IXRAM3 IXRAM2 IXRAM1 IXRAM0
Selects Internal Extension RAM Capacity
0
1
1
0
0
0 byte
Others
Setting prohibited
Table 2-2 indicates the setting of IXS.
Table 2-2. Set Value of Internal Extension RAM Size Select Register
Targeted Model
Set Value of IXS
μ
PD178023, 178024
0CH
7
0
6
0
5
0
4
IXRAM4
3
I
XRAM3
2
I
XRAM2
1
I
XRAM1
0
I
XRAM0
Symbol
IXS
At reset
0CH
R/W
R/W
Address
FFF4H
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