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參數(shù)資料
| 型號： | UPD178023GF |
| 廠商： | NEC Corp. |
| 元件分類： | 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 |
| 文件頁數(shù)： | 17/56頁 |
| 文件大?。?/td> | 261K |
| 代理商： | UPD178023GF |
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17
μ
PD178023, 178024
Data Sheet U14126EJ1V0DS00
2.1 Memory Size Select Register (IMS)
The memory size select register (IMS) sets the internal memory capacity.
Set the
μ
PD178023,
μ
PD178024 to C6H, C8H respectively.
Use an 8-bit memory manipulation instruction to set the IMS.
This register is set to CFH at reset.
Caution Be sure to set the IMS to C6H or C8H as the program initial setting. The IMS set value changes
to CFH when reset. Therefore, set C6H or C8H again after reset.
Figure 2-2. 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
0
1
1
0
24K bytes
1
0
0
0
32K bytes
Others
Setting prohibited
Table 2-1 indicates the setting of IMS.
Table 2-1. Set Value of Memory Size Select Register (IMS)
Targeted Model
Set Value of IMS
μ
PD178023
C6H
μ
PD178024
C8H
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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