參數(shù)資料
型號: μPD78F0034Y
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): 16/52頁
文件大?。?/td> 309K
代理商: ΜPD78F0034Y
m
PD78F0034Y
16
Preliminary Data Sheet
3. MEMORY SIZE SWITCHING REGISTER (IMS)
This register sets a part of internal memory not used by software. The memory mapping can be made the same
as that of mask ROM versions with different types of internal memory (ROM and 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 those of mask ROM versions.
Table 3-1. Set Value of Memory Size Switching Register
Target Mask ROM Versions
IMS Set Value
m
PD780031Y
42H
m
PD780032Y
44H
m
PD780033Y
C6H
m
PD780034Y
C8H
Caution
When using mask ROM versions, set values indicated in Table 3-1 to IMS.
IMS
RAM2 RAM1 RAM0
0
ROM3 ROM2 ROM1 ROM0
ROM3
0
0
0
1
ROM2
0
1
1
0
ROM1
1
0
1
0
ROM0
0
0
0
0
Selection of Internal ROM Capacity
8 Kbytes
16 Kbytes
24 Kbytes
32 Kbytes
1
1
1
1
60 Kbytes (setting prohibited)
Other than above
Setting prohibited
7
6
5
4
3
2
1
0
FFF0H
CFH
W
Address
After reset
R/W
RAM2
0
1
RAM1
1
1
RAM0
0
0
Selection of Internal High-speed RAM Capacity
512 bytes
1024 bytes
Other than above
Setting prohibited
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