參數(shù)資料
型號: MBT678
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): 79/106頁
文件大小: 1648K
代理商: MBT678
MB90670/675 Series
79
(2)Specification for Power-on Reset
(AV
SS
= V
SS
= 0.0 V, T
A
= –40
°
C to +85
°
C)
Value
Unit
Min.
Max.
30
ms
*: V
CC
must be kept lower than 0.2 V before power-on.
Notes :
The above ratings are values for causing a power-on reset.
When HST is set to “L” level, apply power according to this table to cause a power-on reset irrespective of
whether or not a power-on reset is required.
For built-in resources in the device, re-apply power to the resources to cause a power-on reset.
There are internal registers which can be initialized only by a power-on reset. Apply power according to this
rating to ensure initialization of the registers.
Parameter
Symbol
Pin name
Condi-
tion
Remarks
Power supply rising time
t
R
V
CC
*
Due to repeated
operations
Power supply cut-off time
t
OFF
V
CC
1
ms
V
CC
t
OFF
0.2 V
2.7 V
0.2 V
0.2 V
t
R
RAM data retained
V
SS
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.
Main power
supply voltage
Sub power supply voltage
I
t is recommended to keep the rising
speed of the supply voltage at 50 mV/ms
or slower.
V
CC
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