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存儲器

存儲器在電子地磅中擴展應用

發布日期:2022-10-09 點擊率:64

存儲器在電子地磅中擴展應用

電子地磅單片機系統中需要擴展存儲器時要注意以下幾點:

 (l)分清存儲器的類型。芯片的選擇包括程序存儲器(只讀存儲器ROM一般作為程序存儲器)、數據存儲器、可只擴展ROM或RAM,也可同時擴展ROM和RAM。

(2)擴展注意點。擴展時應注意讀寫控制、片選控制、地址的分配、地址譯碼、器件選型(盡量選擇容量留有余量的芯片)、速度匹配等。因此,片選端、輸出使能端、寫選通端等引腳需要落實。例如,如圖4 -28所示為8031片選端、輸出使能端、寫選通端等引腳的外連方式。

其中,MCS-51單片機訪問外部程序存儲器所使用的控制信號有:ALE.低8位地址鎖存控制信號;PSEN,外部程序存儲器“讀取”控制信號。

存儲器在電子地磅中擴展應用

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