键盘是单片机系统最常用的廉价输入设备,单片机系统通过键盘可以获得数据、地址或命令。单片机与键盘的接口必须解决下述问题: 1.检测是否有键按下,若有键按下,判定是哪一个键,且确定该键的键码数据。 2.去抖动。键被按下至键值稳定,键被抬起至键 The keyboard is the most commonly used cheap input device of the one-chip computer system, the one-chip computer system can obtain the data, address or order through the keyboard. SCM and keyboard interface must solve the following problems: 1. Detect whether there is a key press, if the key is pressed, to determine which one key, and to determine the key key data. Go to jitter The key is pressed until the key is stable, the key is raised to the key