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F28377 SCI烧写问题请教?

1、使用SCIA烧写F28377D,使用C2Prog.exe,V1.7版本

2、烧写过程中出现下面提示:

*** PLEASE RESET TARGET IN SCI BOOT-LOADER MODE ***
Connecting with target (autobaud)...  OK.
Bootloading...  OK.
Please wait...
Connecting with target...  failed (no response)!

这是为什么,把USB转TTL的线缆换了两种现象都差不多;

谢谢---