\ \ port definitions for Atmega128 as found on the Arduino Mega128 \ decimal PORTE 0 portpin: digital.0 \ PE 0 ** 0 ** USART0_RX PORTE 1 portpin: digital.1 \ PE 1 ** 1 ** USART0_TX PORTE 4 portpin: digital.2 \ PE 4 ** 2 ** PWM2 PORTE 5 portpin: digital.3 \ PE 5 ** 3 ** PWM3 PORTG 5 portpin: digital.4 \ PG 5 ** 4 ** PWM4 PORTE 3 portpin: digital.5 \ PE 3 ** 5 ** PWM5 PORTH 3 portpin: digital.6 \ PH 3 ** 6 ** PWM6 PORTH 4 portpin: digital.7 \ PH 4 ** 7 ** PWM7 PORTH 5 portpin: digital.8 \ PH 5 ** 8 ** PWM8 PORTH 6 portpin: digital.9 \ PH 6 ** 9 ** PWM9 PORTB 4 portpin: digital.10 \ PB 4 ** 10 ** PWM10 PORTB 5 portpin: digital.11 \ PB 5 ** 11 ** PWM11 PORTB 6 portpin: digital.12 \ PB 6 ** 12 ** PWM12 PORTB 7 portpin: digital.13 \ PB 7 ** 13 ** PWM13 PORTJ 2 portpin: digital.14 \ PJ 1 ** 14 ** USART3_TX PORTJ 0 portpin: digital.15 \ PJ 0 ** 15 ** USART3_RX PORTH 2 portpin: digital.16 \ PH 1 ** 16 ** USART2_TX PORTH 0 portpin: digital.17 \ PH 0 ** 17 ** USART2_RX PORTD 3 portpin: digital.18 \ PD 3 ** 18 ** USART1_TX PORTD 2 portpin: digital.19 \ PD 2 ** 19 ** USART1_RX PORTD 1 portpin: digital.20 \ PD 1 ** 20 ** I2C_SDA PORTD 0 portpin: digital.21 \ PD 0 ** 21 ** I2C_SCL PORTA 0 portpin: digital.22 \ PA 0 ** 22 ** D22 PORTA 1 portpin: digital.23 \ PA 1 ** 23 ** D23 PORTA 2 portpin: digital.24 \ PA 2 ** 24 ** D24 PORTA 3 portpin: digital.25 \ PA 3 ** 25 ** D25 PORTA 4 portpin: digital.26 \ PA 4 ** 26 ** D26 PORTA 5 portpin: digital.27 \ PA 5 ** 27 ** D27 PORTA 6 portpin: digital.28 \ PA 6 ** 28 ** D28 PORTA 7 portpin: digital.29 \ PA 7 ** 29 ** D29 PORTC 8 portpin: digital.30 \ PC 7 ** 30 ** D30 PORTC 6 portpin: digital.31 \ PC 6 ** 31 ** D31 PORTC 5 portpin: digital.32 \ PC 5 ** 32 ** D32 PORTC 4 portpin: digital.33 \ PC 4 ** 33 ** D33 PORTC 3 portpin: digital.34 \ PC 3 ** 34 ** D34 PORTC 2 portpin: digital.35 \ PC 2 ** 35 ** D35 PORTC 1 portpin: digital.36 \ PC 1 ** 36 ** D36 PORTC 0 portpin: digital.37 \ PC 0 ** 37 ** D37 PORTD 7 portpin: digital.38 \ PD 7 ** 38 ** D38 PORTG 2 portpin: digital.39 \ PG 2 ** 39 ** D39 PORTG 1 portpin: digital.40 \ PG 1 ** 40 ** D40 PORTG 0 portpin: digital.41 \ PG 0 ** 41 ** D41 PORTL 7 portpin: digital.42 \ PL 7 ** 42 ** D42 PORTL 6 portpin: digital.43 \ PL 6 ** 43 ** D43 PORTL 5 portpin: digital.44 \ PL 5 ** 44 ** D44 PORTL 4 portpin: digital.45 \ PL 4 ** 45 ** D45 PORTL 3 portpin: digital.46 \ PL 3 ** 46 ** D46 PORTL 2 portpin: digital.47 \ PL 2 ** 47 ** D47 PORTL 1 portpin: digital.48 \ PL 1 ** 48 ** D48 PORTL 0 portpin: digital.49 \ PL 0 ** 49 ** D49 PORTB 3 portpin: digital.50 \ PB 3 ** 50 ** SPI_MISO PORTB 2 portpin: digital.51 \ PB 2 ** 51 ** SPI_MOSI PORTB 1 portpin: digital.52 \ PB 1 ** 52 ** SPI_SCK PORTB 0 portpin: digital.53 \ PB 0 ** 53 ** SPI_SS PORTF 0 portpin: digital.54 \ PF 0 ** 54 ** A0 PORTF 1 portpin: digital.55 \ PF 1 ** 55 ** A1 PORTF 2 portpin: digital.56 \ PF 2 ** 56 ** A2 PORTF 3 portpin: digital.57 \ PF 3 ** 57 ** A3 PORTF 4 portpin: digital.58 \ PF 4 ** 58 ** A4 PORTF 5 portpin: digital.59 \ PF 5 ** 59 ** A5 PORTF 6 portpin: digital.60 \ PF 6 ** 60 ** A6 PORTF 7 portpin: digital.61 \ PF 7 ** 61 ** A7 PORTK 0 portpin: digital.62 \ PK 0 ** 62 ** A8 PORTK 1 portpin: digital.63 \ PK 1 ** 63 ** A9 PORTK 2 portpin: digital.64 \ PK 2 ** 64 ** A10 PORTK 3 portpin: digital.65 \ PK 3 ** 65 ** A11 PORTK 4 portpin: digital.66 \ PK 4 ** 66 ** A12 PORTK 5 portpin: digital.67 \ PK 5 ** 67 ** A13 PORTK 6 portpin: digital.68 \ PK 6 ** 68 ** A14 PORTK 7 portpin: digital.69 \ PK 7 ** 69 ** A15 \ some digital ports have an alternative use \ synonym is available since amforth 5.0 synonym analog.0 digital.54 synonym analog.1 digital.55 synonym analog.2 digital.56 synonym analog.3 digital.57 synonym analog.4 digital.58 synonym analog.5 digital.59 synonym analog.6 digital.60 synonym analog.7 digital.61 synonym analog.8 digital.62 synonym analog.9 digital.63 synonym analog.10 digital.64 synonym analog.11 digital.65 synonym analog.12 digital.66 synonym analog.13 digital.67 synonym analog.14 digital.68 synonym analog.15 digital.69 synonym SPI:SS digital.53 synonym SPI:MOSI digital.51 synonym SPI:MISO digital.50 synonym SPI:SCK digital.52 synonym TWI:SDA digital.20 synonym TWI:SCL digital.21 synonym LED_BUILTIN digital.13 synonym SERIAL:RX digital.0 synonym SERIAL:TX digital.1