topic Re: S32k144 BUS CLOCK in S32K

S32k144 BUS CLOCK

hajianik — Tue, 12 Dec 2017 22:58:34 GMT

I was wondering is there a way to look at the BUS CLOCK on the scope for S32K144 target?

Not talking about PLL,OSC, ....

Thanks

Re: S32k144 BUS CLOCK

danielmartynek — Thu, 14 Dec 2017 13:20:13 GMT

Hi,

Only Flash clock can be routed to CLKOUT pins.

BUS_CLK in CHIPCTL_CLKOUTSEL can't be selected on S32K144 (0N47T).

It should be available on S32K144 (0N57U).

Regards,

Daniel

Re: S32k144 BUS CLOCK

hajianik — Fri, 31 Aug 2018 20:15:29 GMT

Hi Daniel,

So what is the setting for Flash clock in CHIPCTL_CLKOUTSEL ?

I looked at the manual for the description of this register, I don't see a flash /slow clk for CLKOUTSEL field in there.

I have configured PTD14 as clkout output.I tried different combination of CLKOUTDIV / CLKOUTSEL , they show up just as a high output on the scope.

How do I find out if my target is(0N47T) or (0N57T) ?

Thanks,

Koorosh Hajiani

Re: S32k144 BUS CLOCK

danielmartynek — Tue, 04 Sep 2018 10:48:53 GMT

Hi Koorosh,

Below is the routing, Figure 27-1 RM, rev.8

Don't forget to enable the function in SIM_CHIPCTL_CLKOUTEN.

The mask set can be found printed on the MCU package.

Regards,

Daniel

Re: S32k144 BUS CLOCK

hajianik — Tue, 04 Sep 2018 18:58:05 GMT

Hi Daniel,

It is not working for me. My target is S32K146 , MASK:0N73V

please see my setting:

PTD14: CLKOUT

Using PE CLKOUT

SIM_CHIPCTL Setting

SCG_CLKOUT

I JUST DON'T ANYTHING ON PTD14.

I TRIED DIFFERENT COMBO WITH NO LUCK.

Thanks

Re: S32k144 BUS CLOCK

danielmartynek — Wed, 05 Sep 2018 15:13:32 GMT

Hi Koorosh,

Haven't tried with SDK, but this simple code works for me.

#include "S32K146.h" /* include peripheral declarations S32K146 */

int main(void)
{
  PCC->PCCn[PCC_PORTD_INDEX]=PCC_PCCn_CGC_MASK; //Enable clock for PORTD
  PORTD->PCR[14] |= PORT_PCR_MUX(7);            //Alternative 7, set pin as CLKOUT
  SCG->CLKOUTCNFG = SCG_CLKOUTCNFG_CLKOUTSEL(0);//CLKOUTCNFG_CLKOUTSEL(0), Flash clock
  SIM->CHIPCTL |= SIM_CHIPCTL_CLKOUTSEL(0);     //CHIPCTL_CLKOUTSEL(0), Flash clock
  SIM->CHIPCTL |= SIM_CHIPCTL_CLKOUTDIV(0);     //Output clock divide by 1
  SIM->CHIPCTL |= SIM_CHIPCTL_CLKOUTEN(1);      //Enable CLKOUT

  for(;;) 
  {
  }

/* to avoid the warning message for GHS and IAR: statement is unreachable*/
#if defined (__ghs__)
#pragma ghs nowarning 111
#endif
#if defined (__ICCARM__)
#pragma diag_suppress=Pe111
#endif
 return 0;
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Regards,

Daniel