| T0 | PB0 | 1 | 40 | PA0 | ADC0 | |||
| T1 | PB1 | 2 | 39 | PA1 | ADC1 | |||
| AIN0 | PB2 | 3 | 38 | PA2 | ADC2 | |||
| AIN1 | PB3 | 4 | 37 | PA3 | ADC3 | |||
| SS | PB4 | 5 | GND | GND | 36 | PA4 | ADC4 | |
| MOSI | PB5 | 6 | MOSI | B | 35 | PA5 | ADC5 | |
| MISO | PB6 | 7 | MISO | A | 34 | PA6 | ADC6 | |
| SCK | PB7 | 8 | SCK | +12V | 33 | PA7 | ADC7 | |
| RESET | 9 | VCC | RESET | 32 | AREF | |||
| VCC | 10 | 31 | AGND | |||||
| GND | 11 | 30 | AVCC | |||||
| XTAL2 | 12 | 29 | PC7 | |||||
| XTAL1 | 13 | 28 | PC6 | |||||
| RXD | PD0 | 14 | 27 | PC5 | ||||
| TXD | PD1 | 15 | R/B | 26 | PC4 | |||
| INT0 | PD2 | 16 | OE | 25 | PC3 | |||
| INT1 | PD3 | 17 | WR | 24 | PC2 | |||
| OC1B | PD4 | 18 | BS | 23 | PC1 | |||
| OC1A | PD5 | 19 | XA0 | 22 | PC0 | |||
| ICP | PD6 | 20 | XA1 | 21 | PD7 | OC2 |