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MSP430F67781程序无法下载

Other Parts Discussed in Thread: MSP430F67781, MSP430F6638

最近好不容易买回来的MSP430F67781焊接到板子上后发现无法通过JTAG下载程序,老是提示

Fatal error: Could not find device (or device not supported) Session aborted!

调试了很久换了一块芯片也还是这样,硬件上AVCC和DVCC接3.3v,AUX1,AUX2接地,AUX3接3.3V,VASYS1和VASYS2外部连在一起了,VDSYS1和VDSYS2外部也连在一起了,电压值都正常,LCDCAP也接地了,Vcore也接了470nF到地。但是通过JTAG的双线Spy-Bi-Wire模式一直下不进去程序,用同样的仿真器去给一块MSP430F6638的评估板下载程序又可以下进去,我用的是IAR5.6的破解版,不知道是不是这个版本不支持MSP430F67781啊,,很急,求大虾指点!