\ \ port definitions for Atmegas as found on the Arduino Standard \ Atmega168, Atmega328p \ decimal PORTD 0 portpin: digital.0 PORTD 1 portpin: digital.1 PORTD 2 portpin: digital.2 PORTD 3 portpin: digital.3 PORTD 4 portpin: digital.4 PORTD 5 portpin: digital.5 PORTD 6 portpin: digital.6 PORTD 7 portpin: digital.7 PORTB 0 portpin: digital.8 PORTB 1 portpin: digital.9 PORTB 2 portpin: digital.10 PORTB 3 portpin: digital.11 PORTB 4 portpin: digital.12 PORTB 5 portpin: digital.13 PORTC 0 portpin: digital.14 PORTC 1 portpin: digital.15 PORTC 2 portpin: digital.16 PORTC 3 portpin: digital.17 PORTC 4 portpin: digital.18 PORTC 5 portpin: digital.19 \ some digital ports have an alternative use \ synonym is available since amforth 5.0 synonym SPI:SS digital.10 synonym SPI:MOSI digital.11 synonym SPI:MISO digital.12 synonym SPI:SCK digital.13 synonym TWI:SDA digital.18 synonym TWI:SCL digital.19 synonym LED_BUILTIN digital.13 synonym SERIAL:RX digital.0 synonym SERIAL:TX digital.1 synonym analog.0 digital.14 synonym analog.1 digital.15 synonym analog.2 digital.16 synonym analog.3 digital.17 synonym analog.4 digital.18 synonym analog.5 digital.19 \ not on all chips but defined in arduino sources synonym analog.6 digital.20 synonym analog.7 digital.21