ATmega324PB supports seven additional GPIOs on PORTE [6:0].
The GPIO pins PE0, PE1, and PE4 are assigned to Pin7, Pin8, and Pin29. PE0, PE1, and PE4 are multiplexed with XTAL2, XTAL1, and AREF.
The GPIO pin PC5 is multiplexed with ACO, the Analog Comparator output.
Pin17(VCC), Pin18(GND), Pin38 (VCC), and Pin39 (GND) are replaced by PE2, PE3, PE5, and PE6 respectively.
| 44-pin TQFP/MLF package | ATmega324 variants | ATmega324PB |
|---|---|---|
| Pin 7 | XTAL2 | PE0 (XTAL2) |
| Pin 8 | XTAL1 | PE1 (XTAL1) |
| Pin 17 | VCC | PE2 |
| Pin 18 | GND | PE3 |
| Pin 29 | AREF | PE4 (AREF) |
| Pin 38 | VCC | PE5 |
| Pin 39 | GND | PE6 |