Datasheet

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XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
Table 33-11. Port R - alternate functions.
PORT R PIN # INTERRUPT PDI XTAL
PDI 89 PDI_DATA
RESET 90 PDI_CLOCK
PRO 91 SYNC XTAL2
PR1 92 SYNC XTAL1