10_Lab08_KEYBOARD - Microcomputer Systems and Lab Fall 2010...

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Microcomputer Systems and Lab Fall, 2010 微算機系統與實驗講義 Microcomputer Systems and Lab Fall, 2010 微算機系統與實驗講義 Lab # 7 鍵盤掃描實驗 一、實驗目的: 瞭解鍵盤掃描的方法。請參考講義第七章 7-189 開始。 二、實驗說明: (1) 本實驗用到的單板為 F62 KEYBOARD 4*4 F92 7SEG*4 (2) 鍵盤掃描的原理說明: 鍵盤是將多個按鍵開關排成矩陣形式,如下圖 1 示,習慣上橫的一排稱為一列 (row) ,直的一排稱為一行 (column) ,如圖 1 所示為 4 行x 4 列鍵盤。微電腦要取得鍵盤輸入的資料,主要流程如下: 1. 偵測是否有鍵被按下 2. 讀取按鍵代表意義 在讀取按鍵資料時,主要是利用當按鍵點被按時,相通時產生電位改變,再 利用一個輸入埠來讀取按鍵資料。以下圖 2 為例, P1.0~P1.3 相對應 Key0~Key3 讀取 P1.0~P1.3 4 位元資料,某一位元為 0 ,表示對應的鍵被按下,某一位元為 1
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