廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
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更新時間:2018-01-16 01:08:16瀏覽次數(shù):219
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1746-RT25B 1746-RT25B
1746-RT25B 1746-RT25B
3)存儲器控制電路包括片選控制、讀/寫控制和帶三態(tài)門的輸入/輸出緩沖電路。
①片選控制確定存儲器芯片是否工作。
②讀/寫控制確定數(shù)據(jù)傳輸方向;若是讀指令,則將已被選通的存儲單元中的內(nèi)容傳送到數(shù)據(jù)總線上;若是寫指令,則將數(shù)據(jù)總線上的數(shù)據(jù)傳送到已被選通的存儲單元中。
:張亮(工程師) 專線:
24小時移動專線: 【】
③帶三態(tài)門的輸入/輸出緩沖電路用于數(shù)據(jù)緩沖和防止總線上數(shù)據(jù)競爭。數(shù)據(jù)總線相當于一條車流頻繁的大馬路,必須在綠燈條件下,車輛才能進入這條大馬路,否則要撞車發(fā)生交通事故。同理,存儲器的輸出端是連接在數(shù)據(jù)總線上的,存儲器中的數(shù)據(jù)是不能隨意傳送到數(shù)據(jù)總線上的。例如,若數(shù)據(jù)總線上的數(shù)據(jù)是“1"(高電平5V),存儲器中的數(shù)據(jù)是“0"(低電平OV),兩種數(shù)據(jù)若碰到一起就會發(fā)生短路而損壞單片機。因此,存儲器輸出端口不僅能呈現(xiàn)“1"和“O"兩種狀態(tài),還應具有第三種狀態(tài)“高阻"態(tài)。呈“高阻"態(tài)時,它們的輸出端口相當于斷開,對數(shù)據(jù)總線不起作用,此時數(shù)據(jù)總線可被其他器件占用。當其他器件呈“高阻"態(tài)時,存儲器在片選允許和輸出允許的條件下,才能將自己的數(shù)據(jù)輸出到數(shù)據(jù)總線上。
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