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

That chip has a single address pin, meaning two of these devices can share a bus, so youd need 2 pins for frontside i2c, and 8 pins for 4 backside i2c. Now if you want to get really clever on the backside i2c, you can use a 3:8 decoder ('138) with the outputs feeding the address pins of your chip. You would select the chip and it will have an address of 0 while all the rest will be 1. This will get your backside i2c pin count down to 5 pins (1 I2C bus, and 3 address pins)

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