Datasheet

31XMEGA A4U [DATASHEET]
Atmel-8387G-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_03/2014
15.3.1 Push-pull
Figure 15-1. I/O configuration - Totem-pole.
15.3.2 Pull-down
Figure 15-2. I/O configuration - Totem-pole with pull-down (on input).
15.3.3 Pull-up
Figure 15-3. I/O configuration - Totem-pole with pull-up (on input).
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’.
INn
OUTn
DIRn
Pn
INn
OUTn
DIRn
Pn
INn
OUTn
DIRn
Pn