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參數(shù)資料
| 型號(hào)： | μPD78P054 |
| 廠商： | NEC Corp. |
| 元件分類(lèi)： | 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)： | 20/86頁(yè) |
| 文件大?。?/td> | 502K |
| 代理商： | ΜPD78P054 |
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20
μ
PD78P054, 78P058
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 map as that of mask ROM version having different internal memory
(ROM, RAM) capacity.
The IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to C8H (
μ
PD78P054)/CFH (
μ
PD78P058).
Figure 3-1. Memory Size Switching Register Format (
μ
PD78P054)
Table 3-1 shows the setting values of IMS which makes the memory map the same as that of the various mask
ROM versions.
Table 3-1. Memory Size Switching Register Setting Values (
μ
PD78P054)
Target Mask ROM Version
IMS Setting Value
μ
PD78052
44H
μ
PD78053
C6H
μ
PD78054
C8H
0
0
1
1
0
1
0
0
16 Kbytes
24 Kbytes
1
0
0
0
32 Kbytes
Setting prohibited
Other than above
IMS
FFF0H
C8H
R/W
5
4
Symbol
Address
After reset
R/W
7
6
3
2
0
1
RAM0
0
RAM2 RAM1
ROM3 ROM2
ROM0
ROM1
ROM3 ROM2
ROM0
Selection of Internal
ROM Capacity
ROM1
0
1
1
1
0
0
512 bytes
1024 bytes
Setting prohibited
Other than above
RAM2
RAM0
Selection of Internal
High-speed RAM Capacity
RAM1
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