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I2C module on MKV31F512XX device fails at 120Mhz

Question asked by gokhan gunay on Jan 1, 2019
Latest reply on Jan 7, 2019 by Fang Li

Hi all,

I am playing with I2C module on MKV31F512XX device to controll ssd1306 display.

I could program the device successfully at 8MHZ clock so it is OK at this frequency. But whenever I raise the clock to 120MHZ it fails (after setting baud rate in accordance).  I have attached the oscilloscope outs for both cases. As you can see on the defect case, 9 th clk cycle does not coincide with ACK on SDA.

 

Do you have any experience with this issue? Have you ever used the I2C port while the MCU is running at 120Mhz?

thanks

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