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I2C Clock Control - Fast Mode

Question asked by george on Apr 17, 2013
Latest reply on May 15, 2013 by Clive One
Section 2.6.8 of RM0038 states:

"fPCLK1 must be a multiple of 10MHz to reach the 400kHz maximum I2C fast clock mode"

how can I calculate the maximum I2C frequency I can achieve using a 4.2MHz fPCLK1

this information doesn't seem to be in the reference manual.