基于嵌入式微控制器的一种新型GPIO扩展键盘技术  

A New GPIO Extending Scheme Based on Embedded Microcontroller

作　　者：赵鹏飞[1] 俞建定[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2013年第2期59-63,共5页Journal of Ningbo University：Natural Science and Engineering Edition

摘　　要：提出了一种利用单片机GPIO口结构、二极管单向导电性以及电容充放电原理进行按键扩展的方案,详细叙述了其原理及整体设计,并给出主要软件程序.这种方案扩展了8个按键,但仅占用了MCU的2个GPIO口,大大节省了硬件资源.经实际验证,此按键扩展方案简单实用,特别适用于引脚较少功能且比较强大的MCU开发系统.In this paper,a new interface extending scheme is proposed based on one-way electric conductivity of diode,capacitance charge-discharge principle and the structure of GPIO interface of MCU.Its principles and applications are described and the program is given.In this scheme extending 8 buttons only take 2 GPIO interface of MCU.Thus the hardware resources are saved greatly.Practice shows that this scheme is simple,practical and especially suitable for the MCU system which is powerful but has fewer pins.

关 键 词：IO口 按键 单片机 电容 

分 类 号：TP344.2[自动化与计算机技术—计算机系统结构]