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參數(shù)資料
| 型號(hào)： | MB90V550A |
| 廠商： | Fujitsu Limited |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16位微控制器專有 |
| 文件頁數(shù)： | 37/58頁 |
| 文件大?。?/td> | 695K |
| 代理商： | MB90V550A |
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MB90550A/550B Series
37
(4) Specification for Power-on Reset
(V
CC
=
5.0 V
±
10 %, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
85
°
C)
Value
Unit
Min.
Max.
Note
V
CC
must be kept lower than 0.2 V before power-on.
The above values are used for creating a power-on reset.
Some registers in the device are initialized only upon a power-on reset. To initialize these register, turn on
the power supply using the above values.
Parameter
Symbol
Pin name
Remarks
Power supply rising time
t
R
V
CC
0.05
30
ms
Power-supply start voltage
V
OFF
—
0.2
V
Power-supply end voltage
V
ON
2.7
—
V
Power supply cut-off time
t
OFF
4
—
ms
Due to repeated operations
V
CC
5.0 V
V
CC
3.0 V
0 V
V
SS
t
R
0.2 V
0.2 V
2.7 V
t
OFF
0.2 V
Sudden changes in the power supply voltage may cause a power-on reset.
To change the power supply voltage while the device is in operation, it is recommended to
raise the voltage smoothly to suppress fluctuations as shown below.
In this case, change the supply voltage with the PLL clock not used. If the voltage drop is
1 V or fewer per second, however, you can use the PLL clock.
It is recommended to keep the rising speed of
the supply voltage at 50 mV/ms or slower.
RAM data being held
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