參數(shù)資料
型號: μPD78P078Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 24/84頁
文件大?。?/td> 472K
代理商: ΜPD78P078Y
24
m
PD78P078Y
3.
MEMORY SIZE SWITCHING REGISTER (IMS)
This is a register to disable use of part of internal memories by software. By setting this memory size switching
register (IMS), it is possible to get the same memory mapping as that of the mask ROM versions with a different internal
memory (ROM).
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Figure 3-1. Memory Size Switching Register Format
RAM2
RAM1
RAM0
0
ROM3
ROM2
ROM1
ROM0
7
6
5
4
3
2
1
0
Symbol
IMS
Address
R/W
FFF0H
CFH
After Reset
R/W
Note
When the external device expansion function is used, the internal ROM capacity should be set to 56 Kbytes
or less.
Table 3-1 shows the setting values of IMS which make the memory mapping the same as that of the mask ROM
version.
Table 3-1. Memory Size Switching Register Setting Values
ROM3 ROM2 ROM1 ROM0
Selection of internal
ROM Capacity
1
0
0
0
32 Kbytes
1
0
1
0
40 Kbytes
1
1
0
0
48 Kbytes
1
1
1
0
56 Kbytes
Note
1
1
1
1
60 Kbytes
Other than above
Setting prohibited
RAM2 RAM1 RAM0
Selection of Internal
High-Speed RAM Capacity
1
1
0
1024 bytes
Other than above
Setting prohibited
Target Mask ROM Versions
IMS Setting Value
m
PD78074BY
C8H
m
PD78075BY
CAH
m
PD78076Y
CCH
m
PD78078Y
CFH
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