Datasheet ATmega16M1, ATmega32M1, ATmega64M1 - Summary (Atmel) - 8

QFN32 pin Mnemonic Type Name, function, and alternate function number
10 PE1 I/O XTAL1 (XTAL Input) OC0B (Timer 0 Output Compare B) PCINT25 (Pin Change Interrupt 25) 11 PE2 I/O XTAL2 (XTAL Output) ADC0 (Analog Input Channel 0) PCINT26 (Pin Change Interrupt 26) 1.
Note: 
Only for Atmel Atmega32M1/64M1. 2.
Note: 
On the engineering samples, the ACMPN3 alternate function is not located on PC4. It is located on PE2. Atmel ATmega16M1/32M1/64M1 [DATASHEET] 8 Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Summary-10/2016 Document Outline Introduction Features Table of Contents 1. Pin configurations 1.1. Pin descriptions 2. Ordering Information 2.1. ATmega16M1 2.2. ATmega32M1 2.3. ATmega64M1 3. Overview 3.1. Block diagram 3.2. Pin descriptions 3.2.1. VCC 3.2.2. GND 3.2.3. Port B (PB7..PB0) 3.2.4. Port C (PC7..PC0) 3.2.5. Port D (PD7..PD0) 3.2.6. Port E (PE2..0) RESET/ XTAL1/XTAL2 3.2.7. AVCC 3.2.8. AREF 4. Resources 5. About code examples 6. Data retention 7. Packaging Information 7.1. 32-pin 32A 7.2. PV 32 QFN