Now my wireless module work in -40, test by my program, I find mcu internal spi wil slower than normal temperature, lead to my program run wrong, I use crystals is NX3225SA-32MHZ-EXS00A-CS02368(load capacitance is 9pF, I used external capacitance 11pf ) and DS321G(load capacitance is 10pF, I used external capacitance 11pF),
but I used TWR-MKW24D512 develop board from freescale can work good. My design reference USB-KW24D512 schematic and PCB files. Now I don't found the solution,please give me some
advices,thanks. By modify the load capacitance value,how much impact? how to solve this porblem?This problem affect my project schedule,so I am very worried,thank you for help me!