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→I/O Connections
{| class="wikitable"
!CW308 Pin
!ATXMega CEC1702 Pin!NotesFunction
|-
|GPIO1
|PC3 P104 (TXD0)|Serial OUTPUT from AVR.CEC1702
|-
|GPIO2
|PC2 P105 (RXD0)|Serial INPUT to AVR.CEC1702
|-
|GPIO3
|PA1P030|Spare pin.GPIO
|-
|GPIO4
|PA0P017|Trigger pin.
|-
|CLKIN
|XTAL1XTAL2|Optional CLKIN
|-
|CLKFB
|PB3P002 (PWM5)|Can output clock 12MHz PWM on this pin. Useful for synchronizing to internal RC oscillator.|-|J_TRST|JTAG_RST|JTAG Reset|-|J_TDI|JTAG_TDI|JTAG TDI|-|J_TDO|JTAG_TDO|JTAG TDO|-|J_TMS|JTAG_TMS|JTAG TMS|-|J_TCK|JTAG_CLK|JTAG Clock
|-
|LED1
|PA5P156|GPIO, Breathing LED0
|-
|LED2
|PA6P157|GPIO, Breathing LED1
|-
|LED3
|PA7
|GPIO, LED
|-
|PDIC
|
|SPI buffer output enable, drive high to enable SPI programming and sniffing
|-
|PDID/CS
|QSPI0_CS
|SPI chip select for SPI flash chip
|-
|H1
|P040
|GPIO
|-
|H2
|P031
|GPIO
|-
|H3
|P026
|GPIO
|-
|H4
|P053
|GPIO
|-
|H5
|P054
|GPIO
|-
|H6
|P027
|GPIO
|-
|H7
|P107
|GPIO
|-
|H8
|P120
|GPIO
|-
|PDIDH9|PDIDP112|In-System programming.GPIO
|-
|PDIC/nRSTH10|nRST/PDICP113|In-System programming.GPIO
|}