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I2C通讯的NACK位该如何产生?

Other Parts Discussed in Thread: MSP430F5438, MSP430F169

hi,every one:
我最近在学习如何使用硬件I2C通讯来读取MPU6050,
但是遇到了一些问题:
(1)MPU6050的读时序中,结束位产生之前需要产生一个NACK位,也就是将SCL拉高,翻了几遍手册,还是摸不着头脑该怎样产生这个NACK位,所以特来求助一下大家。


(2)同样是MPU6050的写时序,将I2CSTT开始位置位后并顺利发送了地址和第一帧数据,如果我想继续发送一帧数据,是不是需要要将TXRDYIFG置位?