Datasheet

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XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
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’.
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.
INn
OUTn
DIRn
Pn
INn
OUTn
Pn
INn
OUTn
Pn