In al 80h是什么意思
WebApr 12, 2024 · in,从端口输入; out,输出到端口; in al,21h 从21h端口读取一字节数据到al in ax,21h 从端口地址21h读取1字节数据到al,从端口地址22h读取1字节到ah out 21h,al 将al的值写入21h端口 out 21h,ax 将ax的值写入端口地址21h开始的连续两个字节。 Webin 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个,则可以寻 …
In al 80h是什么意思
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WebAug 2, 2024 · b、255 1111 1111 256 1 0000 0000 OF = 1 a、80H对应着无符号数值为128, 对应着有符号数-128。. b、-128 + (-128) = -256,8位寄存器放不下,最小为-128。. 溢出 … http://www.sczy.com/article-1781.html
WebSep 16, 2008 · out 21h,al 表示将al持有的数据写入21h端口 那么楼主所说的18H和81H都是端口号,具体需要查询一下是哪个设备的端口。 另外需要注意的是:数据输入输出时的地址要放在DX中,数据以AX作传输媒介,具体需要根据传输位来决定是否选用AL、AH … 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。
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. WebJan 3, 2011 · 执行这条指令时,将al中的值与立即数80h(10000000b)执行按位与运算。运算结果反映在标志寄存器上:zf反映结果是否为零;sf反映al的最高位是否为0. 注意两 …
Webpoll: in al, status ;①. test al, 80h ;②. je poll ;③. in al, data ;④. 查询式输出: 通过查询,实现了快速的cpu与慢速外设之间同步交换信息,效率低。只适用于cpu负担不重,要求服务的外设对象不多且任务相对简单的场合。
WebAug 14, 2024 · 9. INT is the assembly mnemonic for "interrupt". The code after it specifies the interrupt code. (80h/0x80 or 128 in decimal is the Unix System Call interrupt) When running in Real Mode (16-bit on a 32-bit chip), interrupts are handled by the BIOS. When running on top of an Operating System, interrupts are handled by the OS through an … grandmother sharkWebNov 24, 2011 · in 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 … grandmother shoesWebDec 20, 2024 · Less than 14 IU/mL. A rheumatoid factor of less than 14 IU/mL is considered to be normal. In the Titer method, the normal ratio is less than 1:80 or 1 to 80.It is to be noted that the normal levels may vary slightly in different laboratories. It is prudent to talk to your doctor who will explain to you the meaning of your test results. chinese half fried chicken near meWebout 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 ... grandmother shoots grandsonWebDec 4, 2004 · 端口读写指令 in:从端口读入数据 格式:in al, 60h ;从 60h 端口读入一个字节。. out:向端口写入数据 格式:out al, 60h ;向 60h 端口写入一个字节。. 在in和out指令中只 … grandmother shoes for weddingWebJun 21, 2024 · 微型计算机原理与接口 练习题1.doc,五、阅读程序 ??1.?阅读下列程序段,回答问题 in al,82h xor ah,ah add ax,ax mov bx,ax mov cx,2 shl bx,cl add ax,bx 程序段的功能是什么? 若从82h端口读入的数据为05h,执行程序段后ax=?程序段的功能是将从82h端口读入的值乘以10,32h 2.?读下列程序段,分析它所实现的 ... grandmother shortsWebApr 25, 2002 · or al,80h ; set keyboard bit out 061h,al ; keyboard acknowledge xchg ah,al ; get back PB ... cli mov al,20h out 20h,al ; send eoi to interrupt controller popall iret The PS/2 8042 Keyboard/Auxiliary Device Controller On the PS/2, an Intel 8042 chip replaces the 8255, using ports 60H and 64H. Port 61H serves as a system control port for ... chinese halle