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I can't download the program to my new board by JTAG. Show Message "Can't halt the core".

Question asked by li.lucky on Dec 26, 2011
Latest reply on Dec 27, 2011 by li.lucky
I am a newbie for STM32F103. I want to download the program to my new pcb board. But I can't finish it, with the message "Can't halt the core".
Some possible reason here:
1. I set NTRST to ground.
It's wrong?
What function is for NTRST?
2. I don't connect oscillator.
Oscillator is necessary when we want to download the program from JTAG?

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