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→I/O Connections
The on-board crystal oscillator is powered from the VREF network, ensuring the on-board oscillator is at an appropriate voltage reference.
{{Infobox|The I/O pins connected to the 20-pin header have diode clamping, with the maximum level set by the VREF network. You must ensure jumper J4 sets a correct reference level. If using any of the official victim boards this is done by setting J4 to receive it's reference level from "J5-VREF" pin.}}
=== 20-Pin Pinout ===