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F2801第一次上电烧写程序界面锁死



我自己手工焊的一块目标板,用CCS3.1编译软件当F2801芯片第一次上电时,目标板连接正常但点击进入烧写界面时,弹出的烧写界面密码项都为默认值FFFF,但显示为锁死状态,解不了锁,请问这是为什么