基于AT89S51单片机接口电路的时序仿真研究

Research on timing analysis simulation of interface circuit based on AT89S51 MCU

高阻态是数字电路接口器件一个重要的状态,是接口电路的硬件设计中容易忽视的一种状态。本文分析研究在某机床控制中74LS373接口芯片在单片机总线技术扩展I/O口时出现的总线冲突的时序仿真,使用接口芯片的高阻态可以有效解决多芯片I/O扩展时的总线冲突。

High impedance state is an important state of digital circuit interface device,which is easy to be neglected in the hardware design of interface circuit. This paper analyszes the time sequence simulation of bus conflict occurred in the 74LS373 interface chip in the control of a machine. The interface chip of high impedance state can effectively solve the problem of bus conflict when the chip is used to expand the I/O port.