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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
聯(lián)系方式:張亮查看聯(lián)系方式
更新時間:2018-03-17 21:04:13瀏覽次數(shù):168
聯(lián)系我們時請說明是泵閥商務(wù)網(wǎng)上看到的信息,謝謝!
1757-SRM--1757-SRM
1757-SRM--1757-SRM
在80C51指令系統(tǒng)中,操作數(shù)可以是1、2、3個,也可以沒有。不同功能的指令,操作數(shù)作用也不同。例如,傳送類指令多數(shù)有兩個操作數(shù),寫在左面的稱為目的操作數(shù)(表示操作結(jié)果存放的單元地址),寫在右面的稱為源操作數(shù)(指出操作數(shù)的來源)。
操作碼與操作數(shù)之間必須用空格分開,操作數(shù)與操作數(shù)之間必須用逗號“,"分開。帶方括號的項可有可無,稱為可選項。由指令格式可見,操作碼是指令的核心,*。
:張亮(工程師) 專線:
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例如一條傳送指令的書寫格式如為:MOV A,3AH ;(3AH)A
它表示將3AH存儲單元的內(nèi)容送到累加器A中。
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