We intend to provide our customers with the best documentation possible to ensure the successful use of Microchip products. Between data sheet updates, a Silicon Errata and Data Sheet Clarification Document will contain the most recent information for the data sheet. The ATmega4808/4809 Silicon Errata and Data Sheet Clarification Document (micorchip.com/DS80000867) is available at the device product page on www.microchip.com.