參數(shù)資料
型號: μPD78F0974
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8 Bit Single Chip Microcontrollers
中文描述: 8位單片機(jī)微控制器
文件頁數(shù): 15/40頁
文件大?。?/td> 232K
代理商: ΜPD78F0974
15
m
PD78F0974
3.
MEMORY SIZE SWITCHING REGISTER (IMS)
This register sets a part of internal memory unused by software. The memory mapping can be made the same
as that of mask ROM version with different type of internal memory (ROM, RAM).
The IMS is set with an 8-bit memory manipulation instruction.
RESET input sets the IMS to CFH.
Figure 3-1. Format of Memory Size Switching Register
Table 3-1 shows the IMS set value to make the memory mapping the same as that of mask ROM version.
Table 3-1. Set Value of Memory Size Switching Register
Target Mask ROM Version
IMS Set Value
m
PD780973(A)
06H
Address: FFF0H
After reset: CFH
R/W
Symbol
IMS
7
RAM2
6
RAM1
5
RAM0
4
0
3
ROM3
2
ROM2
1
ROM1
0
ROM0
RAM2
0
1
Others
RAM1
0
1
RAM0
0
0
Selection of Internal High-speed RAM Capacity
768 bytes
1024 bytes
Setting prohibited
ROM3
0
1
Others
ROM2
1
0
ROM1
1
0
ROM0
0
0
Selection of Internal ROM Capacity
24 Kbytes
32 Kbytes
Setting prohibited
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