ATXMEGA384C3_14 Datasheet, PDF (29/125 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA C3 Microcontroller

15.3.1 Push-pull
Figure 15-1. I/O Configuration - Totem-pole
DIRxn
OUTxn
Pxn
INxn
15.3.2 Pull-down
Figure 15-2. I/O Configuration - Totem-pole with Pull-down (on input)
DIRxn
OUTxn
Pxn
INxn
15.3.3 Pull-up
Figure 15-3. I/O Configuration - Totem-pole with Pull-up (on input)
DIRxn
OUTxn
Pxn
INxn
15.3.4 Bus-keeper
The bus-keeper’s weak output produces the same logical level as the last output level. It acts as a pull-up if the last level
was ‘1’, and pull-down if the last level was ‘0’.
XMEGA C3 [DATASHEET]
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Atmel-8361F-AVR-ATxmega384C3-Datasheet–11/2014