按键显示电路的一种综合设计

Synthetical Design for Key-press Display Circuit

在单片机应用系统中,常用的按键显示电路分别占用不同的I/O口。本文提出了一种综合设计方法,使键盘显示电路公用I/O口,这对于节约I/O口资源,减小应用系统的体积有很大的作用。

In application system of Single-chip microprocessor, key-press display circuits take up respectively I/O port. This paper presents a synthetical design of a key-press display circuit taking up the same I/O port, which is important to save I/O port resource and minish the volume of application system.