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仅用三块IC即可构成一编码十六进制数矩阵键盘的廉价编码器(见图)。该编码器的四位输出编码(A_0~A_3)跟踪十六个按键。它可依靠软件避免按键“毛刺”,使在规定周期内只输出一个按键按下的编码。
With only three ICs, a low-cost encoder that encodes hexadecimal matrix keyboards can be constructed (see figure). The encoder’s four-digit output code (A_0 ~ A_3) tracks sixteen keystrokes. It can rely on the software to avoid key “glitch”, so that only the output of a key press code within the specified period.