Need help setting up MCG on K70

[crezyoz]

I want to run a K70 at 120Mhz using a 12 Mhz xtal connected to EXTAL1/XTAL1(ext osc 1). Nothing connected to Ext Osc 0.

How do I setup the MCG to do that? I can't seem to figure that out. PE's cpu.c init_hardware code hangs here:

  while((MCG_S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */

  }

  while((MCG_S & 0x0CU) != 0x08U) {    /* Wait until external reference clock is selected as MCG output */

  }

But FLL is disabled.   Please advise.

[Petr_H]

Hi,

Could you please post a sample project with the settings? Are you using PLL?

This could also be a hardware issue. Do you use your own board?

best regards

Petr Hradsky

Processor Expert Support Team

[crezyoz]

Petr. It is a bit confusing as to how I use OSC1 as the source for the MCG. I was only able to get OSC0 to work. I am using P.E. to set up the cpus.

I tried it on the TOWER and on my K70 board. I suppose a code segment that does it would be helpful. Perhaps P.E. is messing up?

[Petr_H]

Please find attached an example project configured to use System Oscillattor 1 only in PEE mode with PLL. During startup, RTC oscillator is used instead of System oscillator 1, as the oscillator 1 cannot be used for this.

I was also informed that there has been some errors corrected so I recommend to download latest CodeWarrior 10.3.

best regards

Petr Hradsky

Processor Expert Support  Team

[crezyoz]

I don't see an attachment?

[Petr_H]

You are probably looking via inbox only. Please click on the thread name and see my previous post, you should see the attachment there.

best regards

Petr Hradsky

Processor Expert Support Team

[crezyoz]

Thanks Petr. I have it now.

Do you know if CW10.3 installs over CW10.2 or separately? Since I am at the end of a project I would like ot make sure I can go back to 10.2

Thanks.

P

[BlackNight]

Hi Phil,

do *not* install 10.3 _over_ 10.2 (into the same folder). This is not how it will work. Install 10.3 into a differnt folder, as proposed by the installer. That way you have 10.2 and 10.3 side by side, and can switch back and forwared.

Just keep in mind that typically the project files are upwards compatible, that means that you can import a 10.2 project into 10.3. But the other way round might not work well. I have not seen much issues, but better to make you aware.

Erich

[crezyoz]

Thank you Erich