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10_Lab13_BUZZER_RS232 - Microcomputer Systems and Lab Fall...

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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 # 13 蜂鳴器 & RS232 串列傳輸實驗 一、實驗目的: (1) 瞭解蜂鳴器工作原理以及相關的控制方法。請參考課本第七章 7-213 開始。 (2) 認識 RS232 傳輸方式,並使用 51 內部的串列埠,練習與電腦端傳輸。 二、實驗說明: 1. 蜂鳴器 (buzzer) 工作原理: 使蜂鳴器發出固定頻率的聲音是利用 ’1’ ’0’ 信號的變化所產生,假設 要產生 1KHz 的聲音,只要輸入半週期為 500us 的方波即可。 (1) 瞭解 C 大調音階頻率計算公式 每一音階分為八音度,共分 12 個音,而每個八音度間頻率相差 1 倍, 對於每個音的頻率計算公式如下,其中, F (1) Do 的頻率,例如中音 Do 523Hz ,高音 Do 1046Hz F(n)=2(n-1)xF(1)/12 n=1~12 (2) 精準控制程式時間技巧 必須要精準地控制 Buzzer On/Off
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