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What is the difference between TWI and I2C?

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Can someone tell me what is the difference between TWI and I2C?when i look at the specification it almost the same, have 2 line bus SDA and SCL and the data frame looks so similiar.

Thanks for the attention :)

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difference between twi and i2c protocol

This is the same protocol. Some manufacturers like one name (Atmel uses TWI) other (Philips I2C). They are synonyms.


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twi phillips

"I2C" is registered trademark of Philips. So other manufacturers which have I2C support in their hardware mention it as "TWI".
 

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