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| ATXMEGA128B1_14 Datasheet, PDF (31/142 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller | |||
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15.3.1 Push-pull
Figure 15-1. I/O configuration - Totem-pole
DIRn
OUTn
Pn
INn
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-keeperâs weak output produces the same logical level as the last output level. It acts as a pull-up if the last level
was â1â, and pull-down if the last level was â0â.
XMEGA B1 [DATASHEET] 31
Atmel-8330F-AVR-ATxmega64B1-128B1_datasheetâ02/2014
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