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MSP430 I2C 通讯

1) 关于I2C通讯
a) 最大通讯速度能达到多少bps?SCL时钟能达到多少Mhz?
b) I2C的STOP标志与系统频率和电压的关系?例如,曾经出现在供电电压从3.3V下降到2.8V情况下,STOP标志没有产生的情况。
c) STOP标志的生成机制?是否与系统时钟有关?