I use OSJTAG(through USBPORT[J2]) download program to TWR-K21F120M is OK.
But I use OSJTAG(through USBPORT[J2]) download program to my Test Board is fail
The fail picture is
find OSJTAG but Retry... not find MCU
Have any suggest for me?
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...