Webtest al, al js is_negative ; or test al, 80h jne is_negative If the value in a register was produced by something that sets FLAGS "according to the result", like most ALU instructions such as add ecx, edx , you can js to see if it's negative or not without needing to test ecx, ecx first. WebNov 24, 2011 · in ax,80h;将80H端口的数据输入到AX寄存器中。 out 80h,AL;字节输出指令,将AL寄存器的内容输入到80H端口 5.2 indirect i/o port addressing. 如果端口大于256 …
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Webout dx,al dec dx nosc: in al, dx; 检测转换结束信号 test al,80h jnz nosc; eoc=1, 则等待,检测eoc下降沿 noeoc: in al, dx; test al,80h jz nosc; eoc=0, 则等待,检测eoc上升沿,转换结束 mov dx,02c0h; 读转换结果 in al,dx stos databuf; 保存结果 inc bl; 修改模拟通道地址 loop nexta;cx-1; ret adc0809 endp ... WebThe following instruction will assemble correctly: dec BYTE PTR [edi] true. The following instructions will set the Overflow flag: mov al,80h. sub al,-5. The format for the ADD instruction is: MOV source, destination. false. The SUB instruction requires the source operand to be no larger than the destination operand. small wooden arch decor
all in什么意思 - 百度知道
WebApr 7, 2012 · 例 3.42 or al,80h;将al中最高位置1。 or指令影响标志位为sf,zf,pf。并且使of=cf=0。 3逻辑异或指令 格式:xor dest,src 功能:目的操作数和源操作数按位进行逻辑异或运算,结果送目的操作数。源操作数可以是通用寄存器、存储器或立即数。 WebDec 26, 2014 · in al 20h什么意思啊. 分享. 举报. 你的回答被采纳后将获得:. 系统奖励 15 (财富值+成长值)+ 难题奖励 20 (财富值+成长值). 2个回答. #热议# 普通人应该怎么科学应对『甲流』?. 蓝色火焰的风. 2014-12-26 · 超过21用户采纳过TA的回答. Webin al,80h;将80h端口的数据输入到AL寄存器中; in ax,80h;将80H端口的数据输入到AX寄存器中。 out 80h,AL;字节输出指令,将AL寄存器的内容输入到80H端口; 5.2 indirect i/o … small wooden bamboo spoons honeycomb