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为什么用protues仿两块msp430单片机的i2c的读,波形没有ACK位应答呢?

请问一下,为什么用protues仿两块msp430单片机的i2c的读,波形没有ACK位应答呢,只有八位,以下是我的protues仿真图和主从程序。程序是从网上下载的主从程序读代码。

i2c读的主从程序和protues仿真图.rar