Atmel AVR XMEGA 8/16-bit High Performance Low Power Flash Microcontrollers Fiche technique Page 43

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XMEGA E5 [DATASHEET]
Atmel-8153J–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–11/2014
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.
It is also possible to enable the bridge mode. In this mode, the slave I/O pins are selected from an alternative port,
enabling independent and simultaneous master and slave operation.
PORTC has one TWI. Notation of this peripheral is TWIC. Alternative TWI Slave location in bridge mode is on PORTD.
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