參數(shù)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(shù): 24/70頁
文件大小: 556K
代理商: ΜPD78P0308
μ
PD78P0308
24
Preliminary Data Sheet
IXRAM3
IXRAM2
IXRAM1
IXRAM0
Internal Expansion RAM
Capacity Selection
1
0
1
0
1024 bytes
Other than above
Setting prohibited
Symbol
7
6
5
4
3
2
1
0
Address
After Reset
R/W
IXS
0
0
0
0
IXRAM3
IXRAM2
IXRAM1
IXRAM0
FFF4H
0AH
W
4.
INTERNAL EXPANSION RAM SIZE SWITCHING REGISTER (IXS)
This register is used to set the internal expansion RAM capacity by software. By setting this internal expansion
RAM size switching register (IXS), it is possible to get the same memory map as that of the mask ROM versions with
a different internal expansion RAM capacity.
IXS is set with an 8-bit memory manipulation instruction.
RESET input sets IXS to 0AH.
Figure 4-1. Internal Expansion RAM Size Switching Register Format
Table 4-1 shows the setting values of IXS that make the memory mapping the same as that of the mask ROM
versions.
Table 4-1. Internal Expansion RAM Size Switching Register Setting Values
Target Mask ROM Versions
IXS Setting Value
μ
PD780306
0AH
μ
PD780308
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