How read the system clock on a mke04z8vtg

anto · ‎03-08-2016

is the first time you use mke04z8vt. I have set the internal clock so FEI, I would like to know which registry read to know exactly which is the clock frequency of system (ICSOUTCLK)

jeremyzhou · ‎03-08-2016

Hi Antonello Stella,

After you configure the KE04 work in the FEI mode, the ICSOUT formula is illustrated as below.

Hope it helps.
Have a great day,
Ping

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anto · ‎03-09-2016

Hi eremyzhou,There is an error in your answer. I read the reference manual ,"KE04 Sub-Family Reference ManualSupports: MKE04Z8VTG4(R)", the FEI mode, the internal oscillator frequency is multiplied by 1280 see page 269.So (37.5k x 1280 ) / 2 (default division) = 24MHz.On page 274 there is a sample 20.5.1.1 TO SET THE FREQUENCY 36MHzICS_C2 = 0X00ICS_C1 = 0x04ICS_C3 = TRIM_VALUE_35.15625but applying the formula the result is wrong.Can you explain exactly how the procedure worksThere is a way to read the frequency of system on one pin of the microthank you

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Messaggio originale----

Da: jeremyzhou <admin@community.freescale.com>

Data: 09/03/2016 7.13

A: "Antonello Stella"<microlab.l@libero.it>

Ogg: Re: - How read the system clock on a mke04z8vtg

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How read the system clock on a mke04z8vtg

reply from jeremyzhou in Kinetis Microcontrollers - View the full discussion

Hi Antonello Stella,

After you configure the KE04 work in the FEI mode, the ICSOUT formula is illustrated as below.

Hope it helps.

Have a great day,

Ping

jeremyzhou · ‎03-09-2016

Hi Antonello Stella,

You're right, I made a mistake.

The FLL locks the frequency to 1280 times the internal or external reference frequency, and I've corrected the formula.

Sorry for bringing any inconveniences for you.

Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

anto · ‎03-10-2016

Hi eremyzhou,

On page 274 there is a sample 20.5.1.1 TO SET THE FREQUENCY 36MHzICS_C2 = 0X00ICS_C1 = 0x04ICS_C3 = TRIM_VALUE_35.15625but applying the formula the result is wrong.Can you explain exactly how the procedure worksThere is a way to read the frequency of system on one pin of the microthank you

-

Messaggio originale----

Da: jeremyzhou <admin@community.freescale.com>

Data: 10/03/2016 4.33

A: "Antonello Stella"<microlab.l@libero.it>

Ogg: Re: - How read the system clock on a mke04z8vtg

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NXP Community

How read the system clock on a mke04z8vtg

reply from jeremyzhou in Kinetis Microcontrollers - View the full discussion

Hi Antonello Stella,

You're right, I made a mistake.

The FLL locks the frequency to 1280 times the internal or external reference frequency, and I've corrected the formula.

Sorry for bringing any inconveniences for you.

Have a great day,

Ping

jeremyzhou · ‎03-10-2016

Hi Antonello Stella,

The kind of the code is from KE02's reference manual.

In the KE02, the FLL locks the frequency to 1024 times the internal or external reference frequency, so the code is suited to it.

However for the KE04, the kind of the code is not available and the formula above is correct.
Have a great day,
Ping

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