“SD” and “SC” sounds like I2C – typical I2C frequency is usually either 100 kHz or 400 kHz. A good rule of thumb is to set your frequency to be three or four times larger than the clock ...

Technically, you can go higher or lower, software I2C implementations often do, but some devices might not like it. Hosts often run at 100kHz, but it’s common that you can up the frequency and ...