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S32K144 FTM CLOCK can not set as SYS_CLK

Question asked by zheng lai on Oct 18, 2018
Latest reply on Oct 18, 2018 by zheng lai


   I want to config FTM clock source,according this figure,I choose SYS_CLK as FTM clock.

FTM colck choose



In my codes,I config register so that work,



FTM0->SC |= 0x00030008;


But when I use S32DS Debug find this register value Not equal to I write,


I refer  <<S32K1xx Series Reference Manual, Rev. 7, 04/2018>> ,it describes these bits :

S32K1xx Series Reference Manual

so why s32k144 was force to set CLKS as 11b?  Is setting CLKS as 01b forbidden?