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

Hello,

I had a brief look at the SCCB datasheet section where the serial communication is described. Seems to me that the ninth bit following the address or data bytes is handled differently by this device. Usually, this bit is the acknowledge bit to be pulled low by the receiving device to acknowledge the byte revceived. The SCCB datasheet calls this a don't care bit, and on first reading, I did not fully figure out if it is handled correctly according to the I²C specs. If not, the SX/B I²C routines might have problems, or assume a no acknowledge situation.

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