| E | 09/2021 | 
                            
                         | 
| D | 05/2021 | 
                            - Added silicon revision B
 - Added errata:
- CCL:
                                                The CCL Must be Disabled to Change the
                                                Configuration of a Single LUT
                                        
 - TCA:
                                                Restart Will Reset Counter Direction in NORMAL
                                                and FRQ Mode
                                        
 - TCB:
                                                CCMP and CNT Registers Operate as 16-Bit
                                                Registers in 8-Bit PWM Mode
 - TCD: 
- Asynchronous Input Events Not Working When TCD
                                                  Counter Prescaler is Used
 - Halting TCD and Wait for SW Restart Does Not
                                                  Work if  Compare Value A is ‘
0’
                                                  or Dual Slope Mode is Used 
  
  - Updated errata:
- RTC:
                                                Any Write to the RTC.CTRLA Register Resets the
                                                RTC and PIT Prescaler
                                        
 - TWI:
                                                TIMEOUT Bits in the TWI.MCTRLA Register are Not
                                                Accessible
 
  - Added data sheet clarifications:
- Memories:
                                                Fuses - Factory Default Values
 - SLPCTRL:
                                                Sleep Mode Activity Overview
 - USART:
                                                TXDATA Buffer
 - Package
                                            Drawings: 
- Package Marking Information
 - Package Drawings
 
  
   
                         | 
| C | 06/2020 | 
                            - Added errata:
- Device:
                                                
- Writing the OSCLOCK Fuse in Fuse.OSCCFG to
                                                  ‘1’ Prevents Automatic Loading of
                                                  Calibration Fuses
 
  - USART:
- Full Range Duty Cycle Not Supported When
                                                  Validating LIN Sync Field
 - Open-Drain Mode Does Not Work When TXD is
                                                  Configured as Output
 
  
  - Added clarification for electrical characteristics for AC
                                    peripheral
  
                         | 
| B | 10/2019 | 
                            - Updated document
                                    template
 - Updated errata
                                    2.4.3 ADC Functionality
 - Added
                                    clarification for ADCn.CALIB.DUTYCYC register description
 - Added
                                    clarification for electrical characteristics of ADC and PTC
                                    peripheral
  
                         | 
| A | 06/2019 | Initial document release |