TWI Terminology

The following definitions are frequently encountered in this section.

Table 1. TWI Terminology
Term Description
Master The device that initiates and terminates a transmission. The Master also generates the SCL clock.
Slave The device addressed by a Master.
Transmitter The device placing data on the bus.
Receiver The device reading data from the bus.

The Power Reduction TWI bit in the Power Reduction Register (PRRn.PRTWI) must be written to '0' to enable the two-wire Serial Interface.

TWI0 is in PRR0, and TWI1 is in PRR2.