Datasheet

XMEGA A4U [DATASHEET]
Atmel-8387G-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_03/2014
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Figure 15-4. I/O configuration - Totem-pole with bus-keeper.
15.3.5 Others
Figure 15-5. Output configuration - Wired-OR with optional pull-down.
Figure 15-6. I/O configuration - Wired-AND with optional pull-up.
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