Hardwarerequirements for the MKL26Z128VLH4 SWD-Port

[st165450]

Hello,

im trying to design a pcb, based on a MKL26Z128VLH4.
But i'm not sure, if there are special requirements to implement the swd port. The documentation is not very helpful at this point. My question is, if it's necessary to use a special wiring for the SWD CLK- and DIO signal.

Thanks

Falk

[kerryzhou · Accepted solution]

Hi Falk D .

   About the KL series hardware design, you can refer to this document:

https://www.nxp.com/webapp/Download?colCode=KLQRUG 

Chapter 2 General System Setup (Hardware Considerations)

  To the SWD interface, you need to add 10K pullup in the SWD_DIO pin.

  SWD interface need 5 pins: SWD_DIO, SWD_CLK, RESET, VDD, GND.

  Reset pin in the MCU side should add the 4.7K to 10K pull up resistor, and 0.1uf capacitor to ground.

  About the hardware wire, it is not special, just normally wire in the PCB is OK.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Have a great day,

Kerry

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