由于NUAL程序的特点，在NUAL处理器中实现精确中断比较困难。
Due to the characteristics of the NUAL program, it is difficult to implement precise interrupts in a NUAL processor.
串口和定时器的中断的子程序，对初学的朋友可能比较有用，已经过测试OK ！
Serial port and interrupt subroutine, the friends may be more useful for beginners, has been tested OK!
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