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CCS3.3下仿真F28027的问题

xp系统,XDS100V1。一直在CCS4.2下仿真调试,由于每次连接仿真器、下载代码很慢(下载到flash中),因此将项目文件迁移到CCS3.3中去仿真,编译都没有问题,下载代码有时可以进行,也可以运行,但是有如下提示,有时候直接跳出错误提示窗口,不能完成下载代码

Trouble Setting Breakpoint with the Action "Terminate Program Execution" at 0x3f6ddb: Error 0x00000008/-1066 Error during: Break Point,  Cannot set/verify breakpoint at 0x003F6DDB 
Trouble Removing Breakpoint with the Action "Halt Target" at 0x82dc: Error 0x00000008/-1066 Error during: Break Point,  Cannot set/verify breakpoint at 0x000082DC 
Trouble Removing Breakpoint with the Action "Terminate Program Execution" at 0x3f6ddb: Error 0x00000008/-2044 Error during: Break Point,  No breakpoint at 0x003F6DDB 
Trouble Setting Breakpoint with the Action "Terminate Program Execution" at 0x3f6ddb: Error 0x00000008/-1066 Error during: Break Point,  Cannot set/verify breakpoint at 0x003F6DDB 
Breakpoint Manager: Retrying with a Legacy Hardware breakpoint

已确认在CCS4.2和CCS3.3下的源文件都是一样的,没有改变,仿真器、目标板也都是同一套,电脑也是同一台。试过在CCS4.2下擦除flash,但是也没用。