參數(shù)資料
型號: UPD178P018GC
廠商: NEC Corp.
英文描述: CAT5E PATCH CABLES SNAGLESS,GREEN, 6 FT
中文描述: 8位單片機
文件頁數(shù): 17/52頁
文件大小: 247K
代理商: UPD178P018GC
17
Data Sheet U12920EJ1V0DS00
μ
PD178F098
3. MEMORY SIZE SELECT REGISTER (IMS)
The internal memory capacity of the
μ
PD178F098 can be changed using the memory size select register (IMS).
By using this register, the memory of the
μ
PD178F098 can be mapped in the same manner as a mask ROM model
with a different internal memory capacity.
Use an 8-bit memory manipulation instruction to set the IMS.
This register is set to CFH at reset.
Figure 3-1. Format of Memory Size Select Register (IMS)
RAM2
RAM1 RAM0
Selects internal high-speed RAM capacity
1
1
0
1024 bytes
Others
Setting prohibited
RAM3 RAM2
RAM1
RAM0
Selects internal ROM capacity
1
1
0
0
48K bytes
1
1
1
1
60K bytes
Others
Setting prohibited
Table 3-1 shows the setting of IMS to perform the same memory mapping as that of a mask ROM model.
Table 3-1. Setting of Memory Size Select Register
Targeted Model
Setting of IMS
μ
PD178076, 178096
μ
PD178078, 178098
CCH
CFH
7
RAM2
6
RAM1
5
RAM0
4
0
3
ROM3
2
ROM2
1
ROM1
0
ROM0
Symbol
IMS
At reset
CFH
R/W
R/W
Address
FFF0H
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