Datasheet

129
XMEGA B [DATASHEET]
8291B–AVR–01/2013
12.3.1.2 Totem-pole with Pull-up
In this mode, the configuration is as for totem-pole, expect the pin is configured with internal pull-up when set as input.
Figure 12-4. I/O pin configuration - Totem-pole with pull-up (on input).
12.3.2 Bus-keeper
In the bus-keeper configuration, it provides a weak bus-keeper that will keep the pin at its logic level when the pin is no
longer driven to high or low. If the last level on the pin/bus was 1, the bus-keeper configuration will use the internal pull
resistor to keep the bus high. If the last logic level on the pin/bus was 0, the bus-keeper will use the internal pull resistor
to keep the bus low.
Figure 12-5. I/O pin configuration - Totem-pole with bus-keeper.