In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

I always thought it was screwy too, until I read a clearer explanation in some I2C datasheets. When you want to READ from an I2C device you must first WRITE to the address pointer register of the device -- in other words you are WRITING the address you want to an internal register. When a READ is issued, the device looks to it's own register to see what address to get. This is also why "auto-incrementing" works -- that internal register (in many devices) will increment by one address unit each time a read is issued. So if you are reading subsequent bytes, you do not need to keep writing to the address pointer of the device.

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