I have two PCBs with MK21FX512. I am using two I2C on both PCB. Both act weird. When I put on the same PCB MK60DN512Z and I run same project but for MK60 both I2C working just fine. Is there any difference between module I2C of MK21FX512 and MK60DN512Z? IDE CW10.6 and KDS3.0 generating via PEx same drivers for both processors.