The system realizes digital testing, improves the testing accuracy and makes the result much more a reality because PC and parallel data interface are used.

由于采用了PC机及并行通讯接口，实现了数字化测量，提高了测量精度，具有很好的实时性。

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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。

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To provide examples about the interface of common I2C and AT24C02. And then to introduce the methods of simulating controlled I2C Bus interface with PC parallel socket.

给出了PC并行口与常用I2C器件AT24C02的接口方法实例，介绍了用PC并行口模拟I2C总线控制时序的实现方法。

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