mb90f345caspfv Fujitsu Microelectronics, Inc., mb90f345caspfv Datasheet - Page 23

• Manufacturer Part Number: mb90f345caspfv
• Description: 16-bit Proprietary Microcontroller Cmos 2 F2mc-16lx Mb90340 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

Special care is required for the following when handling the device :
1. Preventing latch-up
2. Handling unused pins
3. Using external clock
4. Precautions for when not using a sub clock signal
HANDLING DEVICES
• Preventing latch-up
• Treatment of unused pins
• Using external clock
• Precautions for when not using a sub clock signal
• Notes on during operation of PLL clock mode
• Power supply pins (V
• Pull-up/down resistors
• Crystal Oscillator Circuit
• Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs
• Connection of Unused Pins of A/D Converter
• Notes on Energization
• Stabilization of power supply voltage
• Initialization
• Port0 to port3 output during Power-on
• Notes on using CAN Function
• Flash security Function
CMOS IC chips may suffer latch-up under the following conditions :
• A voltage higher than V
• A voltage higher than the rated voltage is applied between V
• The AV
Latch-up may increase the power supply current drastically, causing thermal damage to the device.
For the same reason, also be careful not to let the analog power-supply voltage (AV
power-supply voltage.
Leaving unused input pins open may result in misbehavior or latch up and possible permanent damage of the
device. Therefore they must be pulled up or pulled down through resistors. In this case those resistors should
be more than 2 k .
Unused bidirectional pins should be set to the output state and can be left open, or the input state with the above
described connection.
To use external clock, drive the X0 pin and leave X1 pin open.
If you do not connect pins X0A and X1A to an oscillator, use pull-down handling on the X0A pin, and leave the
X1A pin open.
CC
power supply is applied before the V
CC
/V
CC
SS
or lower than V
)
(External-bus mode)
SS
is applied to an input or output pin.
CC
voltage.
Open
CC
and V
X0
X1
SS
MB90340 Series
.
MB90340 Series
CC
, AVRH) exceed the digital
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