I^2C总线技术在并行口扩展方面的应用  

Application of Expanding Parallel Ports Based on I^2C-Bus

作　　者：吕艳[1] 

机构地区：[1]安徽长丰扬子汽车制造有限责任公司,安徽滁州239000

出　　处：《安徽冶金科技职业学院学报》2009年第2期58-60,75,共4页Journal of Anhui Vocational College of Metallurgy and Technology

摘　　要：详细介绍了I2C总线的基本特点、时序和数据传输格式。提出了利用I2C总线扩展单片机的并行口的方法。对于不具有I2C总线的单片机,可以利用其I/O口模拟来实现。这种方法的应用不仅解决了单片机的并行口资源有限的问题,在应用系统中还可以减少连线、缩小体积、降低成本、提高系统的可靠性。最后给出相应的应用实例,其中包括硬件设计和C语言的软件实现。This paper introduces the I^2C - bus basic characteristics, time sequence and data transmission formats in detail. The method of extending parallel ports of Mierocontroller using the I^2C - bus is put forward. As to Microcontrollers with no I^2C - bus, the I/O line of them can simulate I^2C - bus. This application solves the scarcity of parallel ports of Microcontroller, reduces the lines, narrows the volume, lowers costs and improves systematic dependability in the application system. Finally the corresponding application instance is provided, including the hardware design and the software with C language.

关 键 词：I2C总线 并行口 单片机 时序 接口电路 

分 类 号：TP302.1[自动化与计算机技术—计算机系统结构]