2 PD0 Digital Pin (RX) This is the input pin for serial communication 3 PD1 Digital Pin (TX) This is the output pin for serial communication 4 PD2 Digital Pin It is used as an external interrupt 0 5 PD3 Digital Pin (PWM) It is used as an external interrupt 1 6 PD4 Digital Pin It is used for external counter source Timer0 7 Vcc Positive Voltage Positive supply of the system. Pin Name Pin Function Pin Function Description 1 PC6 Reset This pin helps to reset the microcontroller.
