I saw several people talking about this problem in official website, TI. This is not a case. I need to ask for help, because the program can't be downloaded and the project stops, which has caused serious consequences.
Question:
（1）TMS470R1B1M microcontroller is stuck in the Busy interface during the program debugging, and the program cannot be downloaded. At present, two single-chip computers have the same problem. At first, the single-chip computer program can be downloaded, after a period of use, the program can't be downloaded.
Phenomenon:
the working voltage and current of the circuit board are normal, the output signal of the crystal oscillator is normal, and the two reset pins are normal, but the program cannot be downloaded.
（2）With SEGGER J-Flash connection, prompt:
Could not detect CPU clock speed.Readback of test code download into RAM failed.
Failed to measure CPU clock frequency
Failed to connect
