Mov ax word ptr sp
NettetMOV AX, @DATA ; moves the constant represented by @data into AX DirectOperands. is a direct (memory) operand. MOV BX, NUM ; moves the contents of the memory variable ; NUM into AX Direct-Offset Operands A variable name +/- a numeric offset MOV BX, NUM+2 ; moves 2nd byte following NUM into BX Useful for array addressing Nettet30. jan. 2010 · mov ax,[bx]这样就可以了,第一个操作数已经表明了操作的类型是字大小的数据了。 必须显示声明操作数据大小的一般第一个操作数是内存单元的,比如 mov …
Mov ax word ptr sp
Did you know?
Nettet30. apr. 2024 · I don't understand the difference between MOV and MOV ptr. For example, in this C code: unsigned char x, y; x = 2; the second line in assembly is: `MOV x, 2`. but the second line of this C code : tabbyte [0] = 15 unsigned char tabbyte [4] in assembly is : MOV byte ptr tabbyte [0], 15. Nettet24. feb. 2024 · The MOV file format is a so-called container file format, which can bundle multiple elements like video, audio, and subtitles, as well as metadata, such as …
Nettet13. mar. 2024 · 如果使用的是带有偏移量的形式,如 "POPF word ptr [bx+si+42]",则需要先计算出内存地址,然后从该地址中读取 16 位的数据,并将其存储到标志寄存器中。 具体的地址计算过程取决于寻址模式,如基址加变址模式(base-indexed addressing mode)、比例因子加基址加变址模式(scaled-indexed addressing mode)等。 Nettet寻址方式:. 直接寻址:. 端口地址为8位,指令中直接给出端口地址 。. 可以寻256个端口. 间接寻址:. 端口地址为16位。. 指令中的端口地址必须放在DX中 ,可以寻址64K. IN AX,80H ;从80H端口读入16bit的数据到AX MOV DX,2400H IN AL,DX ;从2400H端口读入8bit的数据到AL中 OUT 35H ...
Nettet本来,若变量X定义成了16位的字类型变量(即用DW定义),可以直接写 MOV X, AX. 但因为X未定义成字,可能是用DB定义成了8位的字节,也可能是用DD定义成了32位的 … Nettet15. mar. 2024 · Solution 1. The instruction mov eax, eax may be a no-operation code but that is not what you have here. You're loading from memory, as indicated by the [] …
Nettet执行下面的程序段后,data1单元的值是_____。 data1 db 10h,20h data2 db 30h,40h mov ax,word ptr data1 cmp ax,word ptr data2
Nettet16. mai 2024 · ptr – pointer (指针)缩写。汇编里面 ptr 是规定的字 (保留字)。 mov ax,bx;是把BX寄存器“里”的值赋予AX,由于二者都是word型,不用word mov … how to add wireless keyboard to dell laptopNettet4. mar. 2024 · 设X、Y、Z、W均为双字长数据,各自的低十六位数和高十六位数分别存放在X、X+2、Y、Y+2、Z、Z+2的存储单元中,结果的低十六位字和高十六位字分别存放在W和W+2两个单元中。JD 答:首先打开未来汇编,新建一个空的汇编文件,后缀为.asm,然后输入汇编程序代码,保存,再编译成机器指令,然后连接 ... how to add wireless mouse to chromebookhttp://geekdaxue.co/read/jinsizongzi@zsrdft/on9bf2 how to add wireless mouse logi