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ATXMEGA128B1 Datasheet, PDF (30/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller
Figure 15-4. I/O configuration - Totem-pole with bus-keeper
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15.3.5 Others
Figure 15-5. Output configuration - Wired-OR with optional pull-down
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Figure 15-6. I/O configuration - Wired-AND with optional pull-up
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XMEGA B1 [DATASHEET] 30
8330C–AVR–07/2012