| # | Label | Type |
|---|---|---|
| 1 | PA2 (~RESET/dW) | io |
| 2 | PD0 (RXD) | io |
| 3 | PD1 (TXD) | io |
| 4 | PA1 (XTAL2) | io |
| 5 | PA0 (XTAL1) | io |
| 6 | PD2 (INT0/CKOUT) | io |
| 7 | PD3 (INT1) | io |
| 8 | PD4 (T0) | io |
| 9 | PD5 (T1/OC0B) | io |
| 10 | GND | gnd |
| 11 | PD6 (ICP) | io |
| 12 | PB0 (AIN0/PCINT0) | io |
| 13 | PB1 (AIN1/PCINT1) | io |
| 14 | PB2 (OC0A/PCINT2) | io |
| 15 | PB3 (OC1A/PCINT3) | io |
| 16 | PB4 (OC1B/PCINT4) | io |
| 17 | PB5 (MOSI/DI/SDA/PCINT5) | io |
| 18 | PB6 (MISO/DO/PCINT6) | io |
| 19 | PB7 (SCK/SCL/USCK/PCINT7) | io |
| 20 | VCC | vcc |