topic Re: S32K144 FTM CLOCK can not set as SYS_CLK in S32K

S32K144 FTM CLOCK can not set as SYS_CLK

zhenglai — Thu, 18 Oct 2018 08:43:34 GMT

Hi,

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

In my codes,I config register so that work,

FTM0->MODE |= FTM_MODE_WPDIS_MASK;

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 :

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

razva_tilimpea — Fri, 19 Oct 2018 06:25:40 GMT

Hi,

Are you sure that the value of SC is 0 before calling: FTM0->SC |= 0x00030008;?

Try to replate |= with =.

SC register is not buffered and it is not affected by synchronization mechanism, so SC value must match the value configured by you.

Razvan

zhenglai — Fri, 19 Oct 2018 06:57:51 GMT

Hi,

Sorry,I have find where is problem,register is ok,my code bug! Thank you very much!