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Which of the following uses two data transfers?

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Which of the following uses two data transfers?

(a) auto-incrementing counter

(b) auto-decrementing counter

(c) combined format

(d) single format

I had been asked this question in a job interview.

The query is from I2C-II in section Basic Peripherals of Embedded Systems

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Correct answer is (c) combined format

To elaborate: The EEPROM is having a large number of registers, so auto incrementing counter will not be applicable. So there is an alternative method which uses index value that is written to the chip, prior to accessing the data. This is called combined format and this combined format uses two data transfer. One is to write the data and the other is to read.

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