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JTAG can't not read CPUID register of ADuCM410


I am using Keil uVision to program the ADuCM410 with PWM example code from the pack.

There was no problem at beginning of the test.

However, after the test of modifying the pwm register, it can't be connect ADuCM410 EVAL board.

How can i get back to normal?

Please refer to the screen capture.

Thank you