For communication among parallel print port of PC and multiple single-chips, interface is divided into data, state and control groups respectively controlled by each register.
PC并行打印口与多台下位单片机的通讯，将接口分成数据、状态、控制三组，由其寄存器分别控制。
A small scale distributed varying frequency speed adjustment system implemented by serial communication between IBM - PC and multiple AT89C2051 is introduced.
介绍一种用ibm - PC与多at89c 2051串行通信实现的小型集散变频调速系统。
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