基于20C51单片机的PC键盘测试仪

本介绍了PC键盘的接口规范，并简要说明了键盘扫描码与按键的对应关系，提出了一种简易的键盘测试仪的软硬件设计方案，该测试仪对AT20C51单片微处理器为CPU，配合一些简单的外围接口器件，可用于读取并显示相应的按键键值，从而为维修人员对键盘进行测试与维修提供方便。

A PC-keyboard Checker Based on 20C51.Single -chip Microprocesser

This article writed about the interface specification of PC adapted keyboard and simply described the relation between the key_pressed and its corresponding scan code. This paper also introduced us with the software and hardware design scheme of a simple keyboard checker. This checker used AT20C51 single chip microprocess as its CPU ,combined with some other simple interface components,can be used to read out the key scan code, thus to help the technician to test and maintain their PC adapted keyboard.