I2C总线研究及其基于89S52单片机的模拟实现.docVIP

摘 要 早在1980年，飞利浦公司提出了芯片间控制的双向两线串行I2C总线，I2C是Inter Interated Circuit首字母的缩写。I2C总线仅用一条数据线（SDA）加一条时钟线（SCL）来完成数据的传输及外围器件的扩展，对于各节点的寻址是软寻址的方式，节省了片选线。本文所介绍的I2C总线模拟设计，可使不具备I2C总线接口功能的AT89S52单片机，通过软件编程，仅用两个引脚便可模拟实现I2C总线的功能。这种设计既简化了硬件电路，降低了复杂程度又节省了成本，提高了效率，具有一定的实用价值。 本设计研究了I2C总线的定义、规范以及如何在没有I2C总线接口的AT89S52单片机上模拟实现I2C总线；设计了基于AT89S52单片机的最小系统以及基于ZLG7290的按键输入和LED显示模块、并在硬件基础上编写了相关程序，实现了通过AT89S52单片机模拟的I2C总线接口与ZLG7290的I2C通信。经软硬件制作和调试证明本文所描述的设计是合理可行的。 文章将分为以下几个章节进行论述，第一章是原理及相关设计工具介绍；第二、三章是系统总体设计和详细设计部分；第四章是系统调试与分析部分，最后一章是结论与展望。 关键词：I2C总线，AT89S52，ZLG7290 ABSTRACT As early as 1980’s, the Philips company brought forword the chips of control two-way between two lines of serial I2C bus, I2C is the first alphabet of the initials of Inter Interated Circuit. I2C bus has only one data line (SDA) and a Clock Line (SCL) to complete the transmission of data and the external device pieces of the expansion, to the addressable node is soft addressable manner, saving unit alignment. This paper introduced the use do not have the I2C bus interface function of SCM AT89S52 through software programming, only two pins can be simulated to achieve the full functionality of the bus, that is simplified circuit design, reduce the complexity of cost savings, improved efficiency. The design of the definition of I2C bus, norms and how in the absence of I2C bus interface AT89S52 MCU simulation I2C bus; AT89S52 design based on the smallest microcontroller-based systems, as well as the keys ZLG7290 input and LED Display Module, and hardware on the basis of the relevant procedures, achieved through AT89S52 microcontroller simulation I2C bus interface with ZLG7290 I2C communications. Produced by the hardware and software debugging and described in this paper the design is reasonable and workable. The article is divided into the following chapters exposition, the first chapter is related to the design principles and tools introduced; The second and the third chapters are system design and detailed design; The fout