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參數(shù)資料
| 型號： | μPD78P054 |
| 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)： | 22/86頁 |
| 文件大?。?/td> | 502K |
| 代理商： | ΜPD78P054 |
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22
μ
PD78P054, 78P058
4. INTERNAL EXPANSION RAM SIZE SWITCHING REGISTER (IXS) (
μ
PD78P058 ONLY)
This is a register 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 mask ROM version having different
internal expansion RAM capacity.
The 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 which makes the memory map the same as that of the various mask
ROM versions.
Table 4-1. Internal Expansion RAM Size Switching Register Setting Values
Target Mask ROM Version
IXS Setting Value
μ
PD78052
0CH
μ
PD78053
μ
PD78054
μ
PD78055
μ
PD78056
μ
PD78058
0AH
Remark
Even if the
μ
PD78P058 program that includes "MOV IXS, #0CH" is implemented on the
μ
PD78052,
78053, 78054, 78055, or 78056, its operation will not be affected.
1
1
0
0
0 byte
1
0
1
0
1024 bytes
Setting prohibited
Other than above
IXS
FFF4H
0AH
W
5
4
Symbol
Address
After reset
R/W
7
6
3
2
0
1
0
0
0
0
IXRAM3 IXRAM2
IXRAM0
IXRAM1
IXRAM3IXRAM2
IXRAM0
Selection of Internal
Expansion RAM Capacity
IXRAM1
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