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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
![](/NewShowStand/style/14/Images/Blue/免費(fèi)會(huì)員1.png)
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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
聯(lián)系方式:張亮查看聯(lián)系方式
更新時(shí)間:2018-02-16 18:41:54瀏覽次數(shù):183
聯(lián)系我們時(shí)請(qǐng)說明是泵閥商務(wù)網(wǎng)上看到的信息,謝謝!
1756-DNB/A 1756-DNB/A
1756-DNB/A 1756-DNB/A
從這里我們能得出結(jié)論,在數(shù)據(jù)傳遞中要找到被傳遞的數(shù),很多時(shí)候,這個(gè)數(shù)并不能直接給出,需要變化,這就引出了一個(gè)概念:如何尋找操作數(shù),我們把尋找操作數(shù)所在單元的地址稱之為尋址。在這里我們直接使用數(shù)所在單元的地址找到了操作數(shù),所以稱這種辦法為直接尋址。除了這種辦法之外,還有一種,如果我們把數(shù)放在工作寄存器中,從工作寄存器中尋找數(shù)據(jù),則稱之為寄存器尋址。
:張亮(工程師) 專線:
24小時(shí)移動(dòng)專線: 【】
例:MOV A,R0就是將R0工作寄存器中的數(shù)據(jù)送到累加器A中去。提一個(gè)問題:我們知道,工作寄存器就是內(nèi)存單元的一部份,如果我們選擇工作寄存器組0,則R0就是RAM的00H單元,那么這樣一來,MOV A,00H,和MOV A,R0不就沒什么區(qū)別了嗎?為什么要加以區(qū)別呢?的確,這兩條指令執(zhí)行的結(jié)果是*相同的,都是將00H單元中的內(nèi)容送到A中去,但是執(zhí)行的過程不一樣,執(zhí)行*條指令需要2個(gè)周期,而第二條則只需要1個(gè)周期,*條指令變成zui終的目標(biāo)碼要兩個(gè)字節(jié)(E5H 00H),而第二條則只要一個(gè)字節(jié)(E8h)就能了。
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