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→I/O Connections
{| class="wikitable"
!CW308 Pin
!ATMega328P ATXMega Pin
!Notes
|-
|GPIO1
|PD0 PC3 (RXDTXD0)|Serial INPUT to OUTPUT from AVR.
|-
|GPIO2
|PD1 PC2 (TXDRXD0)|Serial OUTPUT from INPUT to AVR.
|-
|GPIO3
|N/CPA1|Spare pin.
|-
|GPIO4
|PC0PA0|Trigger pin (mapped to ADC-port such that I/O driver power comes from AVCC).
|-
|CLKIN
|-
|CLKFB
|PB0PB3|Can set output clock on this pin as CLKO with fuse. Useful for synchronizing to internal RC oscillator.
|-
|nRSTLED1|nRST (PC6)PA5|Used by in-system-programming (ISP) interface.
|-
|MOSILED2|PA6|PB3 (MOSI)|Used by in-system-programming (ISP) interface.|LED3|PA7|
|-
|MISOPDID|PB4 (MISO)PDID|Used by in-systemIn-System programming (ISP) interface.
|-
|SCKPDIC/nRST|PB5 (SCK)nRST/PDIC|Used by in-systemIn-System programming (ISP) interface.
|}