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TMS320F28377D 的I2C模块 如果不使用FIFO功能,I2CCNT寄存器还有作用吗?

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TMS320F28377D 的I2C模块 如果不使用FIFO功能,I2CCNT寄存器还有作用吗? ARDY位的含义是?ARBL=1,是不是把它清零,然后重新设置成主发送状态即可? NACK和NACKST有什么区别?