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MB90378 Datasheet(PDF) 47 Page - Fujitsu Component Limited.

Part No. MB90378
Description  16-bit Proprietary Microcontroller
Download  65 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
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MB90378 Datasheet(HTML) 47 Page - Fujitsu Component Limited.

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MB90378 Series
47
(3) Power-on Reset
(VCC
= 2.7 V to 3.6 V, AVCC = 2.7 V to 3.6 V, VSS = AVSS = 0.0 V, TA = −40 °C to +85 °C)
* : VCC must be kept lower than 0.2 V before power-on.
Notes :
• The above values are used for causing a power-on reset.
Some registers in the device are initialized only upon a power-on reset. To initialize these registers, turn
on the power supply using the above values.
• Make sure that power supply rises within the selected oscillation stabilization time. If the power supply
voltage needs to be varied in the course of operation, a smooth voltage rise is recommended.
Parameter
Symbol Pin name Condition
Value
Unit
Remarks
Min
Max
Power supply rise time
tR
VCC*
50
ms
Power supply cut-off time
tOFF
VCC*1
ms
Due to repeated
operations
tOFF
tR
2.2 V
0.2 V
0.2 V
0.2 V
VCC
RAM data hold
VCC
1.8 V
VSS
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.


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