1.1 Additional Pin Functionalities

ATmega328PB supports four additional GPIOs on PORTE [3:0].

The GPIO pins PE2 and PE3 are assigned to Pin19 and Pin22. PE2 and PE3 are multiplexed with ADC6 and ADC7.

Pin3 (GND) and Pin6 (VCC) are replaced by PE0 and PE1 respectively. PE0 is multiplexed with ACO.

Table 1-1.  Pin Functionality Difference between ATmega328 Variants and ATmega328PB
32-pin TQFP/MLF packageATmega328 variantsATmega328PB
Pin 3GNDPE0/ACO
Pin 6VCCPE1
Pin 19ADC6ADC6/PE2
Pin 22ADC7ADC7/PE3