參數(shù)資料
型號: 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
文件頁數(shù): 17/32頁
文件大?。?/td> 203K
代理商: ΜPD78F0988
μ
PD78F0988
17
Preliminary Product Information
Table 4-1 shows the IXS setting values to make the memory mapping the same as that of mask ROM versions.
Table 4-1. Set Value of Internal Expansion RAM Size Switching Register
Target Mask ROM Versions
IXS Setting Value
μ
PD780984
0CH
μ
PD780986
0AH
μ
PD780988
4.
INTERNAL EXPANSION RAM SIZE SWITCHING REGISTER (IXS)
This register is used to set internal expansion RAM capacity by software. The memory mapping can be made the
same as that of the mask ROM versions with a different internal expansion capacity by setting IXS.
IXS is set with an 8-bit memory manipulation instruction.
IXS is set to 0CH by RESET input.
Figure 4-1. Format of Internal Expansion RAM Size Switching Register
7
6
5
4
3
2
1
0
Address
After reset
R/W
0
0
0
IXRAM4 IXRAM3 IXRAM2 IXRAM1 IXRAM0
FFF4H
0CH
R/W
IXS
IXRAM4 IXRAM3 IXRAM2
IXRAM1 IXRAM0
Selection of Internal
Expansion RAM Capacity
0
1
0
1
0
1024 bytes
0
1
1
0
0
No internal expansion RAM
Others
Setting prohibited
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