rEDI Pin Mapping
| Arduino | ATmega644P (TQFP44) | |||
|---|---|---|---|---|
| Pin Number | Function | Pin Number | Name | Notes |
| 0 | Digital Pin 0/RX0 | 9 | PD0/RXD0 | Serial |
| 1 | Digital Pin 1/TX0 | 10 | PD1/TXD0 | Serial |
| 2 | Digital Pin 2/RX1 | 11 | PD2/RXD1/INT0 | Serial1 |
| 3 | Digital Pin 3/TX1 | 12 | PD3/TXD1/INT1 | Serial1 |
| 4 | Digital Pin 4/PWM | 13 | PD4/OC1B/XCK1 | Servo 1 |
| 5 | Digital Pin 5/PWM | 14 | PD5/OC1A | Servo 2 |
| 6 | Digital Pin 6/PWM | 15 | PD6/OC2B/ICP | Servo 3 |
| 7 | Digital Pin 7/PWM | 16 | PD7/OC2A | Servo 4 |
| 8 | Digital Pin 8/INT2 | 42 | PB2/INT2/AIN0 | |
| 9 | Digital Pin 9/PWM | 43 | PB3/OC0A/AIN1 | (optional) LCHB 1EN |
| 10 | Digital Pin 10/PWM | 44 | PB4/OC0B/SS | SPI/(optional) LCHB 2EN |
| 11 | Digital Pin 11/MOSI | 1 | PB5/MOSI | SPI |
| 12 | Digital Pin 12/MISO | 2 | PB6/MISO | SPI |
| 13 | Digital Pin 13/SCK | 3 | PB7/SCK | SPI |
| 14 | Digital Pin 14/Analog 0 | 37 | PA0/ADC0 | |
| 15 | Digital Pin 15/Analog 1 | 36 | PA1/ADC1 | |
| 16 | Digital Pin 16/Analog 2 | 35 | PA2/ADC2 | |
| 17 | Digital Pin 17/Analog 3 | 34 | PA3/ADC3 | |
| 18 | Digital Pin 18/Analog 4 | 33 | PA4/ADC4 | |
| 19 | Digital Pin 19/Analog 5 | 32 | PA5/ADC5 | |
| 20 | Digital Pin 20/Analog 6 | 31 | PA6/ADC6 | Thumb wheel trim-pot |
| 21 | Digital Pin 21/Analog 7 | 30 | PA7/ADC7 | Battery/jack voltage monitor |
| 22 | Digital Pin 22 | 40 | PB0/T0/XCK0 | (optional) LCHB 1DIR |
| 23 | Digital Pin 23 | 41 | PB1/CLKO/T1 | (optional) LCHB 2DIR |
| 24 | Digital Pin 24 | 19 | PC0/SCL | TWI/I2C |
| 25 | Digital Pin 25 | 20 | PC1/SDA | TWI/I2C |
| 26 | Digital Pin 26 | 21 | PC2/TCK | |
| 27 | Digital Pin 27 | 22 | PC3/TMS | Piezo speaker |
| 28 | Digital Pin 28 | 23 | PC4/TDO | Switch/LED 1 (Green) |
| 29 | Digital Pin 29 | 24 | PC5/TDI | Switch/LED 2 (Yellow) |
| 30 | Digital Pin 30 | 25 | PC6 | Switch/LED 3 (Red) |
| 31 | Digital Pin 31 | 26 | PC7 | Switch/LED 4 (Blue) |
| AREF | Analog Reference | 29 | AREF | |
| RESET | Reset | 4 | RESET |