Kinetis MicrocontrollersのトピックRe: Regarding TWR-K70F120M-SCH, JTAG connection

Regarding TWR-K70F120M-SCH, JTAG connection

puspamnayak — Wed, 29 Oct 2014 09:25:47 GMT

Hi,

I am using MK70FN1M0VMJ12 in my project and referring TWR-K70F120M-SCH. I found in Tower board in JTAG connection TMS is pulled-up using 10k and when i looked into the reference manual (page 259), its mentioned that K70 has internal Pull-up for TMS.

So want to know why one more pull-up of 10K was used in Tower boad ?

Kindly reply ASAP

Thanks and regards,

Puspam N

Re: Regarding TWR-K70F120M-SCH, JTAG connection

jeremyzhou — Mon, 09 Feb 2015 09:03:22 GMT

Hi Puspam U,

The debug signals are multiplexed with general purpose I/O pins, so some signals will require proper biasing to select the operating mode.

And the JTAG_TMS signal on PTA3 requires a strong pullup resistor for mode selection.
Have a great day,
Ping

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Re: Regarding TWR-K70F120M-SCH, JTAG connection

puspamnayak — Fri, 13 Mar 2015 05:10:27 GMT

Hi Jeremyzhou,

Thanks for giving technical clarification.

Have a nice day !

Thanks once again

Regards,

Puspam