| # | Label | Type |
|---|---|---|
| 1 | VCC | vcc |
| 2 | PB0 (XTAL1/PCINT8) | io |
| 3 | PB1 (XTAL2/PCINT9) | io |
| 4 | PB3 (~RESET/dW/PCINT11) | io |
| 5 | PB2 (INT0/OC0A/CKOUT/PCINT10) | io |
| 6 | PA7 (ADC7/OC0B/ICP/PCINT7) | io |
| 7 | PA6 (ADC6/MOSI/DI/SDA/PCINT6) | io |
| 8 | PA5 (ADC5/MISO/DO/PCINT5) | io |
| 9 | PA4 (ADC4/SCK/SCL/T1/PCINT4) | io |
| 10 | PA3 (ADC3/T0/PCINT3) | io |
| 11 | PA2 (ADC2/AIN1/PCINT2) | io |
| 12 | PA1 (ADC1/AIN0/PCINT1) | io |
| 13 | PA0 (ADC0/AREF/PCINT0) | io |
| 14 | GND | gnd |