topic Re: What pins are used to program and debug the kl2x series in Kinetis Microcontrollers

What pins are used to program and debug the kl2x series

lancerobbins — Thu, 02 Nov 2017 14:12:34 GMT

I have researched the decided that I would like to use the KL24 in my newest design. I have created most of the schematic but it missing on how to load code onto it. I have never used the KL2x series microcontrollers before and I am not sure what lines are used to connect a JTAG programmer to.

Do I load my code directly via the USB connection?

How do I debug my code?

Complete part number that I intend to use is MKL24Z32VFM4.

Re: What pins are used to program and debug the kl2x series

mjbcswitzerland — Thu, 02 Nov 2017 22:38:59 GMT

The KL24 doesn't have JTAG - it has SWD.
Copy the SWD connection circuit from the FRDM-KL25Z diagram: https://www.nxp.com/downloads/en/schematics/FRDM-KL25Z_SCH_REV_E.pdf

There is no ROM loader in the KL24 so you need a debugger (eg. J-Link or P&E) to program it. Code debugging can be done with the same tool using a variety of IDEs - KDS is suitable.

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html
KL25:
- http://www.utasker.com/kinetis/FRDM-KL25Z.html
- http://www.utasker.com/kinetis/TWR-KL25Z48M.html
- http://www.utasker.com/kinetis/RD-KL25-AGMP01.html

Re: What pins are used to program and debug the kl2x series

Robin_Shen — Fri, 03 Nov 2017 01:56:04 GMT

Hi Lance Robbins,

Here is the SWD debug port for Kinetis L series.

You also need to pay attention to the connection of 'RESET_b and NMI_b'.

Kinetis L Peripheral Module Quick Reference is recommend for you to read.

Best Regards,

Robin

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Re: What pins are used to program and debug the kl2x series

lancerobbins — Fri, 03 Nov 2017 18:26:46 GMT

Thank you Mark and Robin,

Below is what I got from your input. I wasn't sure what to do with the NMI_b pin so i tied it to 3V3 through a pull-up.

In my application I will not need a push button reset button as shown in FRDM-KL25Z_SCH_REV_E.pdf.

My circuit is low power and I plan on using the KL24 internal USB Voltage regulator to generate 3V3. It normal operating current should be around 20mA not counting what the KL24 microcontroller uses.

If you see a problem please let me know.

Thanks very much,

Lance

Re: What pins are used to program and debug the kl2x series

Robin_Shen — Mon, 06 Nov 2017 06:14:12 GMT

External Capacitor should be connected with Pin VOUT33.

With the low-power mode, the oscillator has the internal feedback resistor RF. Therefore, the feedback resistor must not be
externally with the Connection 3.

Best Regards,

Robin