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參數(shù)資料
| 型號(hào)： | UPD780024AY |
| 廠(chǎng)商： | NEC Corp. |
| 元件分類(lèi)： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁(yè)數(shù)： | 23/90頁(yè) |
| 文件大?。?/td> | 660K |
| 代理商： | UPD780024AY |
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μ
PD78F0034B, 78F0034BY, 78F0034B(A), 78F0034BY(A)
23
Data Sheet U16369EJ1V0DS
7. MEMORY SIZE SWITCHING REGISTER (IMS)
IMS is a register that is set by software and is used to specify a part of the internal memory that is not to be used.
By setting memory size switching register (IMS), the internal memory of the
μ
PD78F0034B, 78F0034BY, 78F0034B(A),
and 78F0034BY(A) can be mapped identically to that of a mask ROM version.
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Caution The initial value of IMS is setting disabled (CFH). Be sure to set C8H or the value of the target
mask ROM version at the moment of initial setting.
Figure 7-1. Format of Memory Size Switching Register
Table 7-1 shows the IMS set value to make the memory mapping the same as those of mask ROM versions.
Table 7-1. Set Value of Memory Size Switching Register
Target Mask ROM Versions
IMS Set Value
μ
PD780021A, 780021AY, 780031A, 780031AY
42H
μ
PD780022A, 780022AY, 780032A, 780032AY
44H
μ
PD780023A, 780023AY, 780033A, 780033AY
C6H
μ
PD780024A, 780024AY, 780034A, 780034AY
C8H
IMS
RAM2 RAM1 RAM0
0
ROM3 ROM2 ROM1 ROM0
ROM3
0
0
0
1
ROM2
0
1
1
0
ROM1
1
0
1
0
ROM0
0
0
0
0
Selection of Internal ROM Capacity
8 KB
16 KB
24 KB
32 KB
Other than above
Setting prohibited
7
6
5
4
3
2
1
0
FFF0H
CFH
R/W
Address
After reset
R/W
RAM2
0
1
RAM1
1
1
RAM0
0
0
Selection of Internal High-Speed RAM Capacity
512 bytes
1,024 bytes
Other than above
Setting prohibited
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