參數資料
型號: μPD78P0308
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位單片機微控制器
文件頁數: 23/70頁
文件大?。?/td> 556K
代理商: ΜPD78P0308
μ
PD78P0308
23
Preliminary Data Sheet
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 map as that of the mask ROM versions with a different internal
memory (ROM) capacity.
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
Table 3-1 shows the setting values of IMS that make the memory mapping the same as that of the mask ROM
version.
Table 3-1. Memory Size Switching Register Setting Values
RAM2 RAM1 RAM0
Internal High-Speed
RAM Capacity Selection
1
1
0
1024 bytes
Other than above
Setting prohibited
Target Mask ROM Versions
IMS Setting Value
μ
PD780306
CCH
μ
PD780308
CFH
ROM3 ROM2 ROM1 ROM0
Internal
ROM
Capacity
Selection
1
1
0
0
48 Kbytes
1
1
1
1
60 Kbytes
Other than above
Setting prohibited
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