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How is I2C with USI different from I2C with USI_B?

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in Microcontroller by (14.6k points)
How is I2C with USI different from I2C with USI_B?

(a) there is only one common pin between the two devices

(b) here in this case no synchronization is important

(c) the outputs of SDA and SCL are open drain

(d) none of the mentioned

This question was addressed to me during an interview for a job.

I would like to ask this question from I2C topic in chapter MSP430 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct option is (c) the outputs of SDA and SCL are open drain

The explanation: I2C is different in USI than that of USI_B module because here in this module, the output pins SDA and the SCL are open drains in nature.

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