Data in computer networks was transmitted by media, so data always arise question of cut out, interrupt, modify and gorge.

计算机网络中的数据总是通过介质传送，所以数据常常出现被截取、中断、篡改、伪造等安全性问题。

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ST16C554 works in FIFO mode, receives and transmits data by (interrupt) mode with a 16 byte hardware transmit buffer, that will also greatly cut down the load on the CPU.

ST16C 554工作在FIFO模式，采用中断方式收发数据，并有16字节的硬件接收发送缓冲区，降低了CPU的开销。

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