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你好,根据文档说明,将ARM部分的启动模式配置为i2c_slave模式,但是使用上位机作为主机往芯片发送升级程序时,芯片没办法执行,抓取波形发现芯片接收部分数据后一直将始终拉低,没办法继续接收数据,请问这是什么原因?