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參數(shù)資料
| 型號(hào)： | μPD78P064 |
| 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)： | 21/70頁(yè) |
| 文件大?。?/td> | 473K |
| 代理商： | ΜPD78P064 |
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21
m
PD78P064
ROM3 ROM2 ROM1 ROM0
0
1
0
0
16K bytes
0
1
1
0
24K bytes
1
0
0
0
32K bytes
Other than above
Setting prohibited
Selection of Internal
High-Speed RAM Capacity
0
1
0
512 bytes
1
1
0
1024 bytes
Other than above
Setting prohibited
3.
MEMORY SIZE SWITCHING REGISTER (IMS)
This is a register to disable use of part of internal memories by software. By setting this memory size switching register
(IMS), it is possible to get the same memory mapping as that of mask ROM product having different internal memories (ROM,
RAM).
The IMS is set up by the 8-bit memory manipulating instruction.
C8H will result by the RESET input.
Figure 3-1. Memory Size Switching Register Format
7
6
5
4
3
2
1
0
Symbol
Address
R/W
After Reset
RAM2
RAM1
RAM0
0
ROM3
ROM2
ROM1
ROM0
IMS
FFF0H
C8H
Selection of Internal
ROM Capacity
R/W
RAM2 RAM1 RAM0
Table 3-1 shows the set values of IMS which makes the memory map the same as that of the various mask ROM products.
Table 3-1. Memory Size Switching Register Setting Values
Target Mask ROM Product
IMS Setting Value
m
PD78062
44H
m
PD78063
C6H
m
PD78064
C8H
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