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TWR-K21F120M download program to MCU(MK21FN1M0VLQ12) fail

Question asked by 張 峻瑞 on Dec 25, 2014
Latest reply on Dec 25, 2014 by 張 峻瑞

I use OSJTAG(through USBPORT[J2]) download program to TWR-K21F120M is OK.

 

 

ONLY TWR.png

But I use OSJTAG(through USBPORT[J2]) download program to my Test Board is fail

2DEVICE.png

The fail picture is

cant find Device.png

find OSJTAG but Retry... not find MCU

 

Have any suggest for me? 

 

 

some question..

1. MK21FN1M0VLQ12 download program need Crystal (connect to EXTAL and EXTAL0)?

2. I need cut U6 power on TWR-K21F120M, only download to TEST BOARD?

3. On this case, DOWNLOAD PROCESS, TEST BOARD need

    1) POWER 3.3V

     2) JTAG connect / PIN TO PIN

  any orther setting or hardware or...

 

Thanks

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