MB90352 Ver la hoja de datos (PDF) - Fujitsu

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MB90352

16-bit Proprietary Microcontroller

Fujitsu 

MB90350 Series

s HANDLING DEVICES

Special care is required for the following when handling the device :

• 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 (VCC/VSS)

• 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 (External-bus mode)

• Notes on using CAN Function

• Flash security Function

1. Preventing latch-up

CMOS IC chips may suffer latch-up under the following conditions :

• A voltage higher than VCC or lower than VSS is applied to an input or output pin.

• A voltage higher than the rated voltage is applied between VCC and VSS.

• The AVCC power supply is applied before the VCC voltage.

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 (AVCC, AVRH) exceed the digital

power-supply voltage.

2. Handling unused pins

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 kΩ .

Unused bidirectional pins should be set to the output state and can be left open, or the input state with the above

described connection.

3. Using external clock

To use external clock, drive the X0 pin and leave X1 pin open.

MB90350 Series

X0

Open

X1

4. Precautions for when not using a sub clock signal

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.

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