FANUC IC670MDL640L 總線概述
計算機系統是以微處理器為核心的，各器件要與微處理器相連，且必須協調工作，所以在微處理機中引入了總線的概念，各器件共同享用總線，任何時候只能有一個器件發送數據(可以有多個器件同時接收數據) 。
計算機的總線分為控制總線、地址總線和數據總線等三種。而數據總線用于傳送數據，控制總線用于傳送控制信號， 地址總線則用于選擇存儲單元或外設。
2.單片機的三總線結構
51系列單片機具有完善的總線接口時序，可以擴展控制對象，其直接尋址能力達到64k( 2的16次方) 。在總線模式下，不同的對象共享總線，獨立編址、分時復用總線，CPU 通過地址選擇訪問的對象，完成與各對象之間的信息傳遞。
數據總線
51單片機的數據總線為P0口，P0口為雙向數據通道，CPU從P0 口送出和讀回數據。
地址總線
51系列單片機的地址總線為16位。
為了節約芯片引腳，采用P0口復用方式，除了作為數據總線外，在ALE信號時序匹配下，通過外置的數據鎖存器，在總線訪問前半周期從P0口送出低8位地址，后半周期從P0 口送出8位數據。
高8位地址則通過P2口送出。
控制總線
51系列單片機的控制總線包括讀控制信號P3.7和寫控制信號P3.6等，二者分別作為總線模式下數據讀和數據寫的使能信號。
3.單片機總線時序分析
51單片機總線時序如圖2所示：
從圖2中可以看出，完成一次總線(讀寫) 操作周期為T，P0口分時復用，在T 期間，P0口送出低8位地址，在ALE的下降沿完成數據鎖存，送出低8位地址信號。在T1期間，P0口作為數據總線使用，送出或讀入數據，數據的讀寫操作在讀、寫控制信號的低電平期間完成。
需要注意的是，在控制信號(讀、寫信號) 有效期間，P2口送出高8位地址，配合數據鎖存器輸出的低8位地址，實現16位地址總線，即64kB范圍的內的尋址。
由于CPU不可能同時執行讀和寫操作，所以讀、寫信號不可能同時有效。
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