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Which pin provides the reference clock for the transfer of data?

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in Embedded Systems by (271k points)
Which pin provides the reference clock for the transfer of data?

(a) SDA

(b) SCL

(c) SPDR

(d) Interrupt pin

I had been asked this question in an internship interview.

My question is based upon I2C-I topic in chapter Basic Peripherals of Embedded Systems

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Correct option is (b) SCL

To elaborate: The SCL pin can provide the reference clock for the transmission of data but it is not a free running clock.

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