若AX=1E30H,BX=12E4H则ADD AL,BL的执行结果为AL=,CF=。
举一反三
- 若AL=FFH,BL=03H,列表说明下列各指令单独执行后标志OF、SF、ZF、PF、CF的状态。 (1)ADD BL,AL (2)SUB BL,AL (3)NEG BL (4)CMP BL,AL (5)MUL BL (6)IMUL BL (7)INC AL (8)AND BL,AL (9)OR BL,AL (10)XOR BL,BL (11)SAR AL,1 (12)SHR AL,1
- 写出每条汇编指令执行后相关寄存器的值 mov ax,62627 AX=________________ mov ah,31H AX=________________ mov al,23H AX=________________ add ax,ax AX=________________ mov bx,826CH BX=________________ mov cx,ax CX=________________ mov ax,bx AX=________________ add ax,bx AX=________________ mov al,bh AX=________________ mov ah,bl AX=________________ add ah,ah AX=________________ add al,6 AX=________________ add al,al AX=________________ mov ax,cx AX=________________
- 写出下列程序段执行后AX的值为多少? MOV AX, 1234H; AX=(1)H MOV CL, 4 AND AL, 0FH; AX= (2) H ADD AL, 30H; AX= (3)H SHL AH, CL; AX= (4)H AND AH, 0F3H; AX= (5)H
- AL=78H,BL=0F0H,当执行指令ADD AL,BL后,标志位OF=,CF=。
- 【简答题】8.若AL=75H,BL=48H, (1) 求执行指令 ADD AL,BL DAA 之后AL=?标志AF=?CF=?并说明BCD码调整情况。 (2) 若执行指令SUB AL,BL与DAS后,情况又如何?