微机原理与接口应用复习资料

(1).MOVAX,Z；把 Z 送到 AX

SUBAX,X；Z-X

ADDAX,W；W+(Z-X)

MOVZ,AX；结果保存在 Z 中

(2).MOVAX,R；R 送到 AX 中

ADDAX,9；R+9

MOVBX,X；X 送到 BX 中

ADDBX,6；X+6

MOVAX，W；把 W 送到 AX

IMULX；W*X注意：低十六位保存在 AX 里，高

十六位保存在 DX 里

MOVBX，Y；把 Y 送到 BX里

ADDBX，6；Y+6

IDIVBX；（W*X）/(Y+6)注意：商保存在 AX 里，

余数保存在 DX 里

MOVZ，AX；把商送到 Z 中，

MOVR，DX；把余数送到 R 中

(4)

SUBAX,X；W-X

CWD；把 AX 中的十六位带符号数扩展成为 32 位，低十

IMULY；上一步结果再乖以 Y，积为 32 位

MOVBX,2；把 2 送到 BX 中

IMULBX；上一步乘法所得的积再乘以 2，各为 64 位

MOVZ,EAX；把结果中低 32 位放入 Z 双字单元中

MOV[Z+4],EDX；把结果中高 32 位放入 Z+4 双字单元中

18。

指令本条指令执行完后 AX 的内容

执行完后 CF,SF,ZF 的值

MOVAX,1234H1234H

000

MOVCX,42340H

100

MULCX8918H

000

INT20H

程序结束后，（AX）=8918H(DX)=0000H

19。

指令执行完后 AX 的内容执行

MOVAX,00

0010

DECAXFFFFH

0100

ADDAX,7FFFH7FFEH

1101

ADDAX,8000H0000H

1011

SUBAX,1FFFFH

1101

ANDAX,58D1H58D1H

0000

SALAX,1B1A2H

0101

SARAX,1D8D1H

RORAX,19397H

ADD[DATAY+2]，AX

（3）本組指令的作用是：BX<------[DATAX]+[DATAY]+[1](CF 的值)

帶進位加法~

（4）MOVAX，DATAX

MULDATAY；結果的高十六位保存在 DX 裏，低十六位保存

在 AX 裏

（5）MOVAX，DATAX

MOVDX，[DATAX+2]

MULDWORDDATAY；結果的高三十二位保存在 EDX 裏，低三

十二位保存在 EAX 裏

；這裏所用的 DWORD 為一屬性操作符，

在第四章會學到~~

（6）MOVAX，DATAX

DIV17H；結果商保存在 AL 中，余數在 AH 中

NEGAX

SBBDX，0

22。

MOVAX，A；把雙字長數的低字放到 AX 中

MOVDX，[A+2]；把雙字長數的高字放到 DX 中

TESTDX，8000H；測試雙字長數的符號

JZRIGHT；如果是非負數，則直接保存

NEGDX；如果是負數，則求補

1。指令下列指令的错误

（1）MOVAH，BX源操作数与目的操作数长度不相同~

（2）MOV[BX]，[SI]这是两个内存单元在传递数据，而这在汇编语言中

是不允许的~~~

(3)MOVAX，[SI][DI]不能用两个变址连用，其中一个应为基址~

（4）MOVMYDAT[BX][SI]，ES：AX同（2）

（5）MOVBYTEPTR[BX]，1000必须有一个为寄存器

（6）MOVBX，OFFSETMYDAT[SI]OFFSET不能与复杂操作数相连~

（7）MOVCS，AX不能对 CS 赋值~

（8）MOVECX，AX操作数类型不同~

微机原理及应用习题与答案