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总线空闲状态 I2C总线总线的SDA和SCL两条信号线同时处于高电平时，规定为总线的空闲状态。此时各个器件的输出级场效应管均处在截止状态，即释放总线，由两条信号线各自的上拉电阻把电平拉高。 启动信号 在时钟线SCL保持高电平期间，数据线SDA上的电平被拉 ...