Kinetis MicrocontrollersのトピックRe: MKE02Z ICS_C3 TRIM

MKE02Z ICS_C3 TRIM

neilporven — Fri, 27 Nov 2015 17:15:14 GMT

Hi everyone,

I would like to know how to use and trim the MKE02Z ICS_C3. I was following the example

20.5.1.1 FEI mode initialization routine

and I found this line ICS_C3 = TRIM_VALUE_35.15625kHZ; obviously this must be a define, but what value does it have and how

was it created?

I am not using PE, so please use the registers.

Thank you,

Neil

Re: MKE02Z ICS_C3 TRIM

Alice_Yang — Mon, 30 Nov 2015 03:50:56 GMT

Hello Neil.

Which IDE do you use ?

You can check the header file after you create one project .

For example , in KDS IDE, you can directly use like this ICS_C3 , for it have define it in the MKE02Z2.h file :

If i misunderstand your meaning , please tell me ,thank !

Hope it helps

Alice

Re: MKE02Z ICS_C3 TRIM

neilporven — Mon, 30 Nov 2015 17:17:09 GMT

Hi Alice,

I am using KDS 3.0 with KSDK 1.3.0

My include "MKE02Z2.h"

The example is in the : KE02 Sub-Family Reference Manual pdf.

In the example in the manual they have the line ICS_C3 = TRIM_VALUE_35.15625kHZ;

TRIM_VALUE_35.15625kHZ has to be a define, for example

#define TRIM_VALUE_35.15625kHZ 0x45

My question is, how did they calculated the trim value?

Regards,

Neil

Re: MKE02Z ICS_C3 TRIM

Alice_Yang — Mon, 07 Dec 2015 09:06:53 GMT

Hello Neil,

For the example of RM, in my opinion, the trim value is not calculated , it is provide

by the data sheet , from the ke02 data sheet , we can see that :

And we need not configure the register of ICS_C3, for one chip , the data has trimmed by factory .

Hope it helps

Alice

Re: MKE02Z ICS_C3 TRIM

neilporven — Tue, 08 Dec 2015 17:17:06 GMT

Hi Alice,

I did find that reference data sheet and see that the trim is 31.25, but I believe that trim value is from factory.

If you look at the following example from KE02 Sub Family Reference Value:

20.5.1 Initializing FEI mode

The following code segment demonstrates setting ICS to FEI mode.

Example: 20.5.1.1 FEI mode initialization routine

/* the following code segment demonstrates setting ICS to FEI mode generating 36MHz bus*/

ICS_C2 = 0x00; /*BDIV=0, no prescalar

ICS_C1 = 0x04; /* internal reference clock to FLL */

ICS_C3 = TRIM_VALUE_35.15625KHZ; /* FLL output 36MHz */

What is the formula or how do they calculate the 36MHz bus clock?

Re: MKE02Z ICS_C3 TRIM

Alice_Yang — Tue, 22 Dec 2015 07:16:11 GMT

Hello Neil,

This demo is a lite version , so it default the register of SIM_BUSDIV -> BUSDIV is 0,

so the bus clock is the same as ICSOUTCLK , for the BDIV =0, so the ICSOUTCLK is the

same as FLL output 36MHZ.

Of course in you code ,you need configure the register "SIM_BUSDIV" .

Hope it helps

Alice

Re: MKE02Z ICS_C3 TRIM

ivanm — Sun, 27 Dec 2015 02:41:33 GMT

Hi all,

I have the same question as Neil, that seems unanswered.

What is and how to calculate the value of TRIM_VALUE_35.15625KHZ?

In other words: how to calculate the trim value that goes into ICS_C3 and ICS_C4?

If anyone has an answer, please give it in a way we can set those values into registers and not by IDE or JTAG brand dependent.

Thank you.

Re: MKE02Z ICS_C3 TRIM

danielhulshof — Wed, 03 Feb 2016 13:11:09 GMT

Hello Alice, how are you?

I have the same question as Neil and Ivan, running on the same board, with the same IDE.

I'll try to explain the problem differently, maybe you can help us!

I want to configure the chip to run at 40Mhz using the internal oscillator only. No external crystal or oscillator.

It seems to me that all I have to do is to change the ICS Internal Reference Clock from 21.25Khz to 39.0625Khz. Is that correct?

Now the tricky question is: what value must I set to ICS_C3[SCTRIM] to achieve the clock of 39.0625Khz? And how do I calculate it?

Thank you!