VCC9GND8DNC6DNC7DNC10DNC17DNC18DNC19EP21PA5 (ADC5/DO/MISO/OC1B/PCINT5)20PA6 (PCINT6/OC1A/SDA/MOSI/DI/ADC6)16PB3 (PCINT11/RESET/dW)13PA1 (ADC1/AIN0/PCINT1)4PA2 (ADC2/AIN1/PCINT2)3PA7 (PCINT7/ICP/OC0B/ADC7)15PB2 (PCINT10/INT0/OC0A/CKOUT)14PB1 (PCINT9/XTAL2)12PB0 (PCINT8/XTAL1/CLKI)11PA0 (ADC0/AREF/PCINT0)5PA3 (ADC3/T0/PCINT3)2PA4 (ADC4/USCK/SCL/T1/PCINT4)1