Hello Dao Yan Lim:
Please always mention full part number, since there are different K60 devices.
About the bus speed, as you can see in the attached picture (for a K60_100 MHz part), this bus clock depends on the MCG clock module and SIM module divider.
The MCG module is very flexible, so at the same time it is complex to understand. It would be better if you start with Processor Expert, which tells you the core and bus frequencies without you having to worry about MCG configuration registers.
However if you want to make a quick I2C test, out of reset without configuring MCG module, default SIM dividers and slow internal oscillator trimmed to 32.768 kHz as it comes from factory; then the K60 should be in FEI clock mode, with core and bus clocks both at 20.971 MHz. With this frequency you can calculate I2C baud rate.
I hope this helps.
Regards!,
Jorge Gonzalez
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