微处理器应用于生产当中,作为输入用户指令的键盘是必不可少的。目前大多数键盘采用机械开关(按键),这种开关动作时,有一定的抖动时间(见图1波形),故需对其输出波形加以整形(消抖)处理。对单一的键,可要R-S触发器组成无抖开关,但对具有许多键的键盘,采用该法消抖就有一定的困难。本文介绍一种新颖的键盘消抖电路(图2),该电路可消除键盘所有键的抖动,并在合适时刻输出数据 Microprocessors are used in production and are indispensable as keyboards for entering user instructions. At present, most of the keyboard adopts a mechanical switch (button). When this switch is operated, there is a certain jitter time (see the waveform in FIG. 1). Therefore, the output waveform needs to be shaped (debounced). For a single key, the R-S flip-flop can be made without a wobble switch, but with many keys on the keyboard, the use of the law to shake away some of the difficulties. This article describes a novel keyboard debouncing circuit (Figure 2), the circuit can eliminate all key keyboard jitter, and output data at the right moment