Kinetis MicrocontrollersのトピックRe: S9KEAZN64 internal clock configuration

S9KEAZN64 internal clock configuration

zhangzhiyong — Fri, 15 May 2020 02:31:15 GMT

Hi，

I wanted to see how to configure the internal clock of the S9KEAZN64 to be 40MHz？Can you provide a reference code?

Re: S9KEAZN64 internal clock configuration

nxf58904 — Fri, 15 May 2020 08:16:02 GMT

Hi,

Code as follows,please have a try

void Clk_Init(void)
{
   ICS_C1=0x4;        /* Enable the internal reference clock*/
   ICS_C3= 0x90;                       /* Reference clock frequency = 39.0625 KHz*/
   while(!(ICS_S & ICS_S_LOCK_MASK));   /* Wait for FLL lock, now running at 40 MHz (1024 * 39.0625Khz) */
    ICS_C2|=ICS_C2_BDIV(1) ;            /*BDIV=2, Bus clock = 20 MHz*/
   ICS_S |= ICS_S_LOCK_MASK ;            /* Clear Loss of lock sticky bit */
}

Jianyu:

Have a great day,
TIC

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Re: S9KEAZN64 internal clock configuration

zhangzhiyong — Mon, 18 May 2020 03:07:53 GMT

Hi，Jianyu

Thank you for your help，But I found it incorrect when I tried.

Can you provide a program that does that？

KEAZN64，internal clock frequency 40KHz（bus clock 20MHz）+UART（Baudrate 115200）.

Re: S9KEAZN64 internal clock configuration

nxf58904 — Tue, 19 May 2020 06:36:44 GMT

Hi,

You can refer uart (FEI bus 20M baud 115200)code in "SDK-DRIVER-FRDM-KEA-S32DS\KEAZ64 Driver testcode and Examples (for S32DS)\FRDM-KEAZ64_Driver Testcodethis code" ,you can get it from attach file.

Jianyu:

Have a great day,
TIC

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Re: S9KEAZN64 internal clock configuration

zhangzhiyong — Wed, 20 May 2020 00:47:53 GMT

Sorry.

I opened the program，it's programmed with KEAZ64，but I used a KEAZN64.

It's programmed with a 48MHz frequency，KEAZ64 can be tuned to 48MHz at maximum frequency，but the KEAZN64 is only 40MHz.

Re: S9KEAZN64 internal clock configuration

nxf58904 — Wed, 20 May 2020 05:51:54 GMT

Hi,

From the reference manual,KEA64 support S9KEAZN64.

And internal clocking sources is from 31.25-39.0625khz. Which clock do you need to be 40khz.

Refer this demo ,

change the internal clock to 31.25 by config ICS_C3,core clock is 40mhz, bus clock is20Mhz.

change uart2 to uart0. and change BDL to 11. The baud rate as shows in follow pic .

Please have a try.

Jianyu:

Have a great day,
TIC

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Re: S9KEAZN64 internal clock configuration

zhangzhiyong — Wed, 20 May 2020 08:52:49 GMT

Hi，Jianyu

I tried your suggestion，but it didn't work.

First, KEAZ64 and KEAZN64 are two manuals，and KEAZN64's clock is 1024*31.25, not 1280*31.25.

We configured the clock like this, as you suggested. But the test failed.

Re: S9KEAZN64 internal clock configuration

nxf58904 — Thu, 21 May 2020 10:17:16 GMT

Hi,

I do know that KEAZN64 has 1024 times the internal . And from the datasheet, it shows internal clock from 31.25k-39.0625k. The typical value is 31.25k. This value is calibrated by factory .So we need to wite a new trim to ICS-c3.So could you please write ICS_CS =0; Please have a try.

Jianyu:

Have a great day,
TIC

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Re: S9KEAZN64 internal clock configuration

zhangzhiyong — Sun, 24 May 2020 04:58:01 GMT

Hi，Jianyu

I'm so sorry，I tried write ICS_C3 =0，but it didn't work.

I would very much like you to help me write a code. The time is not urgent, you can write when you have time.

（KEAZN64，internal clock frequency 40KHz（bus clock 20MHz）+UART（Baudrate 115200））

Re: S9KEAZN64 internal clock configuration

nxf58904 — Tue, 26 May 2020 02:42:32 GMT

Hi,

I will reply you immediately .

Jianyu:

Have a great day,
TIC

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Re: S9KEAZN64 internal clock configuration

zhangzhiyong — Mon, 08 Jun 2020 07:19:31 GMT

Hi，Jianyu

Thank you，Any progress so far？

Re: S9KEAZN64 internal clock configuration

nxf58904 — Mon, 08 Jun 2020 07:30:23 GMT

Hi,

The fastest internal clock is 39.0625,and this need make a trim via a project with PE tools.

The details see 【经验分享】使用CodeWarrior10.5软件的PE工具trim芯片内部慢速时钟 - Kinetis - 恩智浦技术社区 - 手机版 - Powered by Discuz!

You can use KDS or MCUXpresso to Trim this .

Jianyu:

Have a great day,
TIC

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