topic Re: K70 JTAG interface in Kinetis Microcontrollers

K70 JTAG interface

thefinalset — Wed, 15 Aug 2012 00:48:32 GMT

Hi all, I am designing a device for a school project using a member of Kinetis K70 family and I am having problems with the JTAG part of the schematic. I am not sure where to connect what, as the PE Micro JTAG interface I have is 20 pin for the Kinetis. Could someone please provide me with the schematic for the JTAG inteface or point me to it? Thanks much!

Re: K70 JTAG interface

iafg — Wed, 15 Aug 2012 01:39:04 GMT

Look for the schematics at www.Freescale.com /tower

Re: K70 JTAG interface

thefinalset — Wed, 15 Aug 2012 02:39:37 GMT

Thanks iafg!!

I got the schematic for the TWR-K70F120M and the user manual has the pinout. I on;y have one concern remaning, the pinout for the JTAG connector is different than the one I found for ARM processors here: http://www.jtagtest.com/pinouts/arm20

which do I trust?

Re: K70 JTAG interface

iafg — Wed, 15 Aug 2012 04:22:36 GMT

The "20 pin" interface you show is the older 0.100" spaced one.

The "19 pin interface is what is used on Kinetis. It's really a 20 pin with one pin removed.

The 19 pin is 0.050" spaced pins and is much smaller. You will need an adapter if you are plugging into the older "BIG" 20 pin JTAG

In addition to this there is a smaller 9 pin version.

You can see them here:

http://www.segger.com/jlink-adapters.html

look up

J-Link 19-pin Cortex-M Adapter
J-Link 9-pin Cortex-M Adapter