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MB90800 Datasheet(PDF) 14 Page - Fujitsu Component Limited.

Part # MB90800
Description  16-bit Microcontroller
Download  92 Pages
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90800 Datasheet(HTML) 14 Page - Fujitsu Component Limited.

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MB90800 Series
14
DS07-13733-6E
■ HANDLING DEVICES
1.
Preventing Latch-up, Turning on Power Supply
Latch-up may occur on CMOS IC under the following conditions:
• If a voltage higher than VCC or lower than VSS is applied to input and output pins,
• A voltage higher than the rated voltage is applied between VCC pin and VSS pin.
• If the AVCC power supply is turned on before the VCC voltage.
Ensure that you apply a voltage to the analog power supply at the same time as VCC or after you turn on the
digital power supply (when you perform power-off, turn off the analog power supply first or at the same time as
VCC and the digital power supply).
When latch-up occurs, power supply current increases rapidly and might thermally damage elements. When
using CMOS IC, take great care to prevent the occurrence of latch-up.
2.
Treatment of unused pins
If unused input pins are left open, they may cause abnormal operation or latch-up which may lead to permanent
damage to the semiconductor. Any such pins should be pulled up or pulled down through resistance of at least
2 k
Ω.
Any unused input/output pins should be left open in output status, or if found set to input status, they should be
treated in the same way as input pins.
Any unused output pins should be left open.
3.
Treatment of A/D converter power supply pins
Even if the A/D converter is not used, pins should be connected so that AVCC
= VCC, and AVSS = VSS.
4.
About the attention when the external clock is used
In using an external clock, drive pin X0 only and leave pin X1 open.
The example of using an external clock is shown below.
Please set X0A
= GND and X1A = open without subclock mode.
The following figure shows the using sample.
X0
X1
OPEN
MB90800 Series
X0A
X1A
OPEN
MB90800 Series


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