使用以下汇编代码可以生成一个锯齿波：Mov dx，portd Mov al，0ffh Repeat：Inc al Out dx，al JMP repeat 若要改变锯齿波的周期，可以使用NOP或延时指令来控制。例如：Mov dx，portd Mov al，0ffh Repeat：Inc al Out dx，al Call delay1 JMP repeat Delay1：Mov cx，data1 Delay2：Loop delay...
CALL DELAY2 LOOP Y2 MOV AH,1;待定,有键按下退出 INT 16H JZ S MOV AH,4CH INT 21H ;回到起始状态,不断循环 DELAY1 PROC NEAR ;短延时子过程 PUSH CX ;CX入栈保护(保护外循环次数) MOV CX,08000H ;置LOOP次数 T:LOOP T ;跳转至本身,延时作用 POP CX ;CX出栈 RET ;返回 DELAY1 ENDP DELAY...
1;中断时的入栈顺序是pushf,push cs, push ip2assume cs : codesg, ss : stacksg34stacksg SEGMENT5dw64dup (0)6stacksg ENDS78910codesg SEGMENT1112start:;改变中断向量到本程序中的中断例程处13movax,014moves, ax15movax, stacksg16movss, ax17movsp,6418movds, ax1920;分别将中断程序cs:ip入栈ds...
CALL DELAY jmp back b2: mov dx,c_port in al,dx test al,00000100b jnz li call xianshicj call display_dec mov cx,1 jz next2 mov si,6 dec cx next2: call delay jmp back li: mov buf,0 ;清0 mov buf+1,0 mov buf+2,0 mov buf+3,0 mov buf+4,0 mov buf+5,0 mov dat2,0...
若延时不是秒的10数次倍，误差稍微大点）Delay Proc Nearpush dxpush cxxor ax,axint 1ahmov cs:Times,dxmov cs:Times[2],cxRead_Time: xor ax,axint 1ahsub dx,cs:Timessbb cx,cs:Times[2]cmp dx,Didasjb Read_Timepop cxpop dxretTimes dw 0,0Delay ...
CODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AX;设置8255工作方式MOVDX,PORTDMOVAL,REGISOUTDX,AL;设置输出端口为端口AMOVDX,PORTAG1:;取LED数组的首地址MOVSI,OFFSET LEDG2:MOVAL,[SI]OUTDX,AL;输出显示;延时操作CALLDELAY;如果当前值等于数组最后一个数的值则从头开始CMPAL,0BFHJEG1;地址加一...
=列号*5+ 行号;键值存放在DL存放器中KEYVALUE PROCPUSH AXMOV AL,0FFHOUT 42H,ALCALL DELAYCALL DELAYCALL DELAYMOV AL,00HOUT42H,ALPOP AXMOVdl,lMOVDH,HMOVAL,5MULDL;列号乘5MOVDL,ALADDDL,DHCMPDL,0JZQICMPDL,1JZBACMPDL,2JZJIUCMPDL,5JZSHCMPDL,6JZWUCMPDL,7JZLIUCMPDL,9JZJISHU_CALL ;自动计数...
23、 al,0 out dx,al ;关所有八段管 mov al,bx mov dx,OUTSEG out dx,al mov dx,OUTBIT mov al,ah out dx,al ;显示一位八段管 push ax mov ah,1 call Delay pop ax shr ah,1 inc bx dec cl jnz DLoop mov dx,OUTBIT mov al,0 out dx,al ;关所有八段管 retDelay: ;延时子程序 push...
CALLDELAY1 CALLDELAY1 LEASI,LEDTAB MOVBL,BUF+1 MOVBH,0 MOVAL,[BX][SI];取十位段码 notal MOVDX,A_PORT OUTDX,AL;用数码管显示十位 MOVAL MOVDX,B_PORT OUTDX,AL CALLDELAY MOVAL,0H MOVDX,B_PORT OUTDX,AL CALLDELAY1 LEASI,LEDTAB ...
call delay jmp select ;--- ;delay ;定义延时子程序 ; pushcx ; push ;movcx, ; d1:movbx,0fh ; d2:decbx ;jnz d2 ;pop bx ;popcx;ret ; endp ;--- delay:延时程序 pushf bx push cx保护现场 mov bx,0e0h lp2: movcx ,176h lp1: pushf;标志入栈 popf ;标志...