| REST | 1 | 28 | PC5 | ADC5 | ||||
| RXD | PD0 | 2 | 27 | PC4 | ADC4 | |||
| TXD | PD1 | 3 | R/B | 26 | PC3 | ADC3 | ||
| INT0 | PD2 | 4 | OE | 25 | PC2 | ADC2 | ||
| INT1 | PD3 | 5 | WR | 24 | PC1 | ADC1 | ||
| T0 | PD4 | 6 | BS | 23 | PC0 | ADC0 | ||
| VCC | 7 | 22 | AGND | |||||
| GND | 8 | 21 | AREF | |||||
| XTAL1 | 9 | RESET | VCC | 20 | AVCC | |||
| XTAL2 | 10 | +12V | SCK | 19 | PB5 | SCK | ||
| T1 | PD5 | 11 | A | MISO | 18 | PB4 | MISO | |
| AIN0 | PD6 | 12 | B | MOSI | 17 | PB3 | MOSI | |
| AIN1 | PD7 | 13 | GND | GND | 16 | PB2 | SS | |
| ICP | PB0 | 14 | 15 | PB1 | OC1 |