My guess , never having read anything, is that TWI might stand for 3-wire-interface. such as SPI I2C is a 2-wire interface, and funnily enough it's usually that one which is anonymised, as it is ( or was ) a Philips patent. D.
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Re: [AVR-Chat] what is the diffrence between I2C & TWI?
2005-10-28 by David Collier