Chapter 16
Appendix
XVI - 2 Cautions for Circuit Setup
16.1 Cautions for Circuit Setup
16.1.1 General Usage
■ Connection of V
DD
pin and V
SS
pin
All of the VDD and VSS pins should be connected directly to the power supply and GND in the external. Put
them on printed circuit board after the location of LSI (package) pin is confirmed. Connection error may lead a
fusion and breakdown of a microcontroller.
■ Cautions for Operation
1. If you install the product close to high-field emissions (under the cathode ray tube, etc.), shield the package
surface to ensure normal performance.
2. Operation temperature should be well considered. Each product has different condition. For example, if the
operation temperature is over the condition, improper operation could be occurred.
3. Operation voltage should be also well considered. Each product has different operating range.
• If the operation voltage is over the operating range, duration of the product could be shortened.
• If the operation voltage is below the operating range, improper operation could be occurred.
16.1.2 Unused Pins
■ Unused Functions
Disable all unused functions.
■ Unused Pin (Only for Output)
Leave all unused output-dedicated pins open.
Figure:16.1.1 Unused pin (Output Pins)
OPEN
Output
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