TWI2

The Atmel Two-wire Interface (TWI) interconnects components on a unique two-wire bus, made up of one clock line and one data line with speeds of up to 400 Kbits per second, based on a byte-oriented transfer format. TWI2 can be used with any Atmel Twowire Interface bus Serial EEPROM and I²C compatible device such as Real Time Clock (RTC), Dot Matrix/Graphic LCD Controllers and Temperature Sensor, to name but a few. The TWI is programmable as a master or a slave with sequential or singlebyte access. Multiple master capability of TWI2 is supported. Arbitration of the bus is performed internally and puts the TWI in slave mode automatically if the bus arbitration is lost.A configurable baud rate generator permits the output data rate to be adapted to a wide range of core clock frequencies.Below, Table 1-1 lists the compatibility level of the Atmel Two-wire Interface in Master Mode and a full I2C compatible device.