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Chapter 2
Pin Functions
Preliminary User’s Manual U17566EE1V2UM00
2.7 Recommended connection of unused pins
If a pin is not used, it is recommended to connect it as follows:
• output pins: leave open
• input pins: connect to V
DD5
or V
SS5
Sub oscillator
connection
If no sub oscillator crystal is connected, connect XT1 to V
ss
and leave XT2
open.
Note
If the overall maximum output current of a concerned pin group exceeds its
maximum value the output buffer can be damaged. We recommend the
placement of a series resistor to prevent damage in case of accidentally
enabled outputs. Refer to the absolute maximum rating parameter in the
Electrical Target Specification.
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