ATXMEGA16A4_14 Datasheet, PDF (28/108 Pages) ATMEL Corporation – Non-volatile Program and Data Memories

15.3.1 Push-pull
Figure 15-1. I/O configuration - Totem-pole
DIRn
OUTn
INn
XMEGA A4
Pn
15.3.2 Pull-down
Figure 15-2. I/O configuration - Totem-pole with pull-down (on input)
DIRn
OUTn
Pn
INn
15.3.3 Pull-up
Figure 15-3. I/O configuration - Totem-pole with pull-up (on input)
DIRn
OUTn
Pn
INn
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’.
8069R–AVR–06/2013
28
Not recommended for new designs -
Use XMEGA A4U series