topic Re: Running KL03 without an Xtal OSC in Kinetis Microcontrollers

Running KL03 without an Xtal OSC

tedmawson — Mon, 25 Apr 2016 14:09:37 GMT

I'm trying to use a MKL03Z32CAF4R without a crystal. The KSDK doumentation says "MCG uses the OSC as an external reference clock source." Does this mean is can use it as a reference of it needs it as a reference?

If it IS OK to run MCG lite without any OSC, what accuracy will I get asking for 2 MHz clock from it?

Re: Running KL03 without an Xtal OSC

dereksnell — Mon, 25 Apr 2016 14:47:54 GMT

Hi Ted,

Yes, you can use the internal oscillators to clock the MCU without needing an external crystal. Below is the Clocking Diagram of the MCU from the KL03 reference manual.

And the datasheet contains the accuracy of the internal oscillators. See the snipped below for the 2MHz IRC.