Contents: 1, test Objective: To understand the key principles of scanning two to...
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内容: 1、试验目的:了解按键的扫描原理 2、实现现象:同时按键抢答,先按的键有效,其他按键锁死 复位后重新开始抢答 3、硬件要求:按键 LED灯 原理:最先按下按键者有效,其他均无效-Contents: 1, test Objective: To understand the key principles of scanning two to achieve phenomenon: the key to answer in the same time, press the key and effective, other key-lock reset and re-start to answer in 3, the hardware requirements: button LED lights principle: first press the keys are valid, others are null and void
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