Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002058A-page 49
ATxmega128A1U/ATxmega64A1U
It is possible to disable the TWI drivers in the device, and enable a four-wire digital interface for connecting to an external
TWI bus driver. This can be used for applications where the device operates from a different V
CC
voltage than used by the
TWI bus.
PORTC, PORTD, PORTE, and PORTF each has one TWI. Notation of these peripherals are TWIC, TWID, TWIE, and
TWIF.