廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
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更新時(shí)間:2018-03-26 02:58:43瀏覽次數(shù):345
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1747-L511 1747-L511
1747-L511 1747-L511
存儲(chǔ)空間中的對(duì)象定位
8051單片機(jī)的存儲(chǔ)器是哈佛結(jié)構(gòu),即程序存儲(chǔ)器和數(shù)據(jù)存儲(chǔ)器分開(kāi),并有各自的尋址機(jī)構(gòu)和方式。因?yàn)镕ranklin C51是面向8051系列單片機(jī)及硬件控制系統(tǒng)的開(kāi)發(fā)工具。它定義的任何數(shù)據(jù)類(lèi)型必須以一定的數(shù)據(jù)方式定位在8051 的某一存儲(chǔ)區(qū)中。該編譯器將變量、常量定義成不同的存儲(chǔ)類(lèi)型,把它們定位在不同的存儲(chǔ)區(qū)中。類(lèi)型和區(qū)域的對(duì)照如下:
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★主食:AB,施耐德和GE 發(fā)那科
★四菜一湯:AB 1785、1756、1747、1784,施耐德140系列,發(fā)那科A06B系列,西門(mén)子6ES,505系列熱賣(mài)!
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:張亮
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手 機(jī):
: 2314094943
code :程序存儲(chǔ)區(qū)(64KB),由MOVC A, @A+DPTR訪問(wèn)
xdata: 外部數(shù)據(jù)存儲(chǔ)區(qū) (64KB), 由MOVX A, @DPTR訪問(wèn)
pdata: 分頁(yè)(256B)外部數(shù)據(jù)存儲(chǔ)區(qū), 由MOVX A,@Ri訪問(wèn)
data: 直接尋址內(nèi)部數(shù)據(jù)存儲(chǔ)區(qū)(128B), 訪問(wèn)變量速度快
bdata: 可位尋址的內(nèi)部數(shù)據(jù)存儲(chǔ)區(qū), 允許位與字節(jié)混合訪問(wèn)(16B).
idata: 間接尋址內(nèi)部數(shù)據(jù)存儲(chǔ)區(qū)(128B)
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