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The latest MCUs make it feasible to include programmable I2 C slaves in low-cost systems. Most low-speed serial devices communicate with each other using the I2 C bus. Although there's a wide variety of I2 C slave ICs, programmable I2 C slaves are rare. One such programmable slave is the microcontroller (MCU). Forcing a microcontroller to emulate an I2 C slave device isn't a difficult task, but un