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Microcontroller Programming » I2C communications

October 24, 2009
by mikedoug
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The docs for the MPU talks about SCL and SDA -- what pins are those? I don't see that explained in the docs...

October 24, 2009
by mrobbins
(NerdKits Staff)

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Hi mikedoug,

Chapter 21 of the ATmega168 datasheet, titled "2-wire serial interface" and abbreviated TWI, is Atmel's way of avoiding the Philips trademarks on the name I2C. :-)

The actual pin numbers are MCU pin #28 for SCL, and MCU pin #27 for SDA. That's written on page 2 of the ATmega168 datasheet, under "pin configurations".

And I'm guessing that you're looking into this in relationship to the "Biology Project" post?

Mike

October 24, 2009
by mikedoug
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The Biology Project post got me looking into it -- that and a heck of a lot of curiosity. :)

MikeDoug

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