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參數(shù)資料
| 型號(hào)： | μPD78F0988 |
| 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(yè)數(shù)： | 16/32頁(yè) |
| 文件大?。?/td> | 203K |
| 代理商： | ΜPD78F0988 |
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μ
PD78F0988
16
Preliminary Product Information
Table 3-1 shows the IMS settings value to make the memory mapping the same as those of mask ROM versions.
Table 3-1. Set Value of Internal Memory Size Switching Register
Target Mask ROM Versions
IMS Setting Value
μ
PD780984
C8H
μ
PD780986
CCH
μ
PD780988
CFH
3.
INTERNAL MEMORY SIZE SWITCHING REGISTER (IMS)
This register is set by software not to use a part of internal memory. The memory mapping can be made the same
as that of mask ROM versions with different types of internal memory capacity by setting IMS.
IMS is set with 8-bit memory manipulation instructions.
IMS is set to CFH by RESET input.
Figure 3-1. Format of Internal Memory Size Switching Register
7
6
5
4
3
2
1
0
Address
After reset
R/W
IMS
RAM2 RAM1 RAM0
0
ROM3 ROM2
ROM1 ROM0
FFF0H
CFH
R/W
ROM3 ROM2
ROM1 ROM0
Selection of Internal
ROM Capacity
1
0
0
0
32 Kbytes
1
1
0
0
48 Kbytes
1
1
1
1
60 Kbytes
Others
Setting prohibited
RAM2 RAM1
RAM0
Selection of Internal
High-Speed RAM Capacity
1
1
0
1024 bytes
Others
Setting prohibited
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