MDK一进单步调试模式，点击运行就出现以下错误：
**JLink Warning: CPU could not be halted
***JLink Error: Can not read register 15 (R15) while CPU is running
***JLink Error: Can not read register 16 (XPSR) while CPU is running
***JLink Error: Can not read register 0 (R0) while CPU is running
***JLink Error: Can not read register 1 (R1) while CPU is running
***JLink Error: Can not read register 2 (R2) while CPU is running
***JLink Error: Can not read register 3 (R3) while CPU is running
***JLink Error: Can not read register 4 (R4) while CPU is running
***JLink Error: Can not read register 5 (R5) while CPU is running
***JLink Error: Can not read register 6 (R6) while CPU is running
***JLink Error: Can not read register 7 (R7) while CPU is running
***JLink Error: Can not read register 8 (R8) while CPU is running
无法进行单步调试
出现错误的MDK版本为474，513，517，使用的Jlink有9.4和7
网上提出的所有解决方案都试过了，没有作用

单片机是STM32F407VET6，5个芯片试了3个，都是一个样子
芯片来源是在芯间，以前批次的芯片是可以单步调试的，采用MDK513和Jlink V9.4

程序是好的，其它方式测试通过了

严重影响调试，为了避免以后出现类似问题，在此求教