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MSP430F1611 通过4线JTAG 仿真, 出现Fatal error: Could not find device (or device not supported) Session aborted!

Other Parts Discussed in Thread: MSP430F1611, MSP-TS430PM64

MSP430F1611,通过4线JTAG仿真,一批板子,有些板子能正常仿真,有些板子不能仿真,出现如下错误:

Thu May 07, 2020 15:49:08: IAR Embedded Workbench 7.12.2 (D:\Program Files\IAR Systems\Embedded Workbench 8.0\430\bin\430proc.dll)
Thu May 07, 2020 15:49:08: Using license: PC-locked license - IAR Embedded Workbench for Texas Instruments MSP430
Thu May 07, 2020 15:49:09: Firmware version 3.11.0.1
Thu May 07, 2020 15:49:09: Interface dll version 3.14.0.0
Thu May 07, 2020 15:49:09: Unknown device : (OpenDevice) , Device=MSP430F1611, PwLength=0
Thu May 07, 2020 15:49:10: Fatal error: Could not find device (or device not supported) Session aborted!
Thu May 07, 2020 15:49:10: IAR Embedded Workbench 7.12.2 (D:\Program Files\IAR Systems\Embedded Workbench 8.0\430\bin\430proc.dll)

RST引脚上接47k和1nf试了不行,JTAG的2脚输出也不行,JTAG的4脚用外部电源输入仿真也不行,

用编程器JTAG的2脚给芯片供电,程序能下载进去。编程器有时候一次不行,重新插板JTAT口就可以下载。

不知道是什么原因?