匯編期末考試重點-資料下載頁
2025-06-07 20:21本頁面
【正文】 。對數(shù)據(jù)段DS進行初始化 MOV DS,AX //AX=0770,DS=0770,IP=0005 。數(shù)值回送運算符（取偏移地址）OFFSET//AX=0770,SI=0000,DI=0000,DS=0770,IP=0008MOV SI,OFFSET DATAS 。取DATAS偏移地址0000，并將值傳遞給SI//AX=0770,SI=0000,DI=0010,DS=0770,IP=000BMOV DI,OFFSET DATAD 。取DATAD偏移地址0010，并將值傳遞給DIMOV CX,16 //AX=0770,CX=0010,SI=0000,DI=0010,DS=0770,IP=000E//AX=0700,CX=0010,SI=0000,DI=0010,DS=0770,IP=0010NEXT: MOV AL,[SI]。讀數(shù)據(jù) DS:0000=00//AX=0700,CX=0010,SI=0000,DI=0010,DS=0770,IP=0012 MOV [DI],AL DS:0010=00//SI=0001,IP=0013 INC SI。加1指令I(lǐng)NC，(SI)(SI)+1 //SI=0001,DI=0011,IP=0014 INC DI。加1指令I(lǐng)NC，(DI)(DI)+1 //CX=000F,IP=0015 DEC CX。減1指令DEC，(CX)(CX)1 //IP=000E JNZ NEXT。條件轉(zhuǎn)移指令JXX，非零轉(zhuǎn)移JNZ，ZF=02DS:0001=00 IP=0010 DS:0011=00 IP=0012 SI=0002,DI=0011,IP=0013 SI=0002,DI=0012,IP=0014 CX=000E,IP=0015 IP=000E3...//IP在NEXT段重復(fù)，從0010000E16最后一輪，當(dāng)CX=0000時，IP=00001001001001000E //AX=0700,CX=0000,SI=10,DI=0020,IP=0018 HLT。停機指令HLT，等待一次外中斷，之后繼續(xù)執(zhí)行程序接下來，ADD [BX+SI],AL DS:0010=00 IP=001A ADD [BX+SI],AL DS:0010=00 IP=001C ADD [BX+SI],AL DS:0010=00 IP=001E ADD [BX+SI],AL DS:0010=00 IP=0020CSEG ENDS END START（堆棧操作程序）。段定義偽指令SEGMENTSSEG SEGMENT 。DW（Define Word）定義字類型，后面的每個操作數(shù)占2個字節(jié) 。DUP賦值操作符，重復(fù)定義數(shù)據(jù)列表，重復(fù)次數(shù)由表達式的值決定 。操作數(shù)為“?”，表示只為變量分配存儲單元，未定義初始值 DW 50 DUP(?) 。100字節(jié)SSEG ENDSCSEG SEGMENT 。段對應(yīng)偽指令A(yù)SSUME ASSUME CS:CSEG,SS:SSEGSTART: MOV AX,SSEG //AX=0770,IP=0003 MOV SS,AX //SS=0770, MOV AX,9000H //AX=9000,IP=0008 MOV SP,0060H //SP=0060,IP=000B MOV BX,382CH //BX=382C,IP=000E PUSH BX。BX進棧 //SP=005E,IP=000F PUSH AX。AX進棧 //SP=005C,IP=0010 POP BX。BX出棧 //AX=9000,BX=9000,SP=005E,IP=0011 POP AX。AX出棧 //AX=382C,BX=9000,SP=0060,IP=0012CSEG ENDS END STA
教學(xué)教案相關(guān)推薦
鄂ICP備17016276號-1