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TM4C123 I2C Slave Mode 时的ACK信号

当I2C工作在SLAVE模式时,如果寄存器I2CSACLCTL中的位ACKOEN为0,ACK信号是硬件自动产生;位ACKOEN设为1后,SLAVE收到数据后,需要通过软件写位ACKOVAL来产生ACK信号,否则SCL信号线被一直拉为低电平。是这样吗?