topic Re: K21F OSC in Kinetis Microcontrollers

K21F OSC

黃佑煊 — Wed, 08 Apr 2015 10:04:27 GMT

Dear sir, I have a TWR-K21F120M

But when I want to 8MHz OSC 12MHz OSC can not be replaced by normal routines.

Re: K21F OSC

kerryzhou — Thu, 09 Apr 2015 03:07:04 GMT

Could you describe your question in details?

Do you want to replace the 8Mhz crystal oscillator in TWR-K21F120M board to 12M crystal oscillator? Or you can't configure the frequent which you want?

Please give me more details.

Have a great day,
Jingjing

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Re: K21F OSC

黃佑煊 — Thu, 09 Apr 2015 03:33:36 GMT

HI, I have a TWR-K21F120M

8MHz can work in normal operation with JLINK, but for a 12MHz oscillator can not normally in operation

Re: K21F OSC

kerryzhou — Thu, 09 Apr 2015 06:45:41 GMT

Hi，

How did you check the operation with 12MHZ oscillator? Change the 8Mhz oscillator to 12Mhz in the tower board?

Did you use oscilloscope check your 12MHZ to see whether your oscillator is oscillating after you download the code which use the external osciilator?

Have a great day,
Jinging

Re: K21F OSC

黃佑煊 — Thu, 09 Apr 2015 07:54:11 GMT

HI,

After I changed the 12MHz OSC, with JLINK burn on code warrior Display IC continuously reset

Re: K21F OSC

kerryzhou — Fri, 10 Apr 2015 08:14:02 GMT

Hi,

Did you also configure your code with 12Mhz OSC? You should modify your code with 12Mhz external OSC instead of 8Mhz code.

Beside, did you check your 12MHZ wave in the oscillator, whether it is oscillating?

Please tell me more information.

Have a great day,
Jingjing

Re: K21F OSC

黃佑煊 — Wed, 15 Apr 2015 07:27:04 GMT

HI !

In other oscillator to change the following?

Re: K21F OSC

kerryzhou — Wed, 15 Apr 2015 07:31:12 GMT

Hi，

Yes， Change this data to your real oscillator data:12000000 . then try again.

Have a great day,
Jingjing